diff --git a/frontend/src/app/app.constants.ts b/frontend/src/app/app.constants.ts
index 17105d97e..2af8117b8 100644
--- a/frontend/src/app/app.constants.ts
+++ b/frontend/src/app/app.constants.ts
@@ -1,4 +1,4 @@
-export const mempoolFeeColors = [
+export const defaultMempoolFeeColors = [
   '557d00',
   '5d7d01',
   '637d02',
@@ -39,6 +39,47 @@ export const mempoolFeeColors = [
   'ae005b',
 ];
 
+export const contrastMempoolFeeColors = [
+  '83fd00',
+  '83f609',
+  '83ef12',
+  '83e71a',
+  '83e023',
+  '83d92c',
+  '83d235',
+  '83cb3e',
+  '83c446',
+  '83bc4f',
+  '83b558',
+  '83ae61',
+  '83a76a',
+  '83a072',
+  '83997b',
+  '839184',
+  '838a8d',
+  '838395',
+  '837c9e',
+  '8375a7',
+  '836eb0',
+  '8366b9',
+  '835fc1',
+  '8358ca',
+  '8351d3',
+  '834adc',
+  '8343e5',
+  '833bed',
+  '8334f6',
+  '832dff',
+  '832dff',
+  '832dff',
+  '832dff',
+  '832dff',
+  '832dff',
+  '832dff',
+  '832dff',
+  '832dff',
+];
+
 export const chartColors = [
   "#D81B60",
   "#8E24AA",
diff --git a/frontend/src/app/components/block-overview-graph/block-overview-graph.component.ts b/frontend/src/app/components/block-overview-graph/block-overview-graph.component.ts
index 003531fce..7ab147345 100644
--- a/frontend/src/app/components/block-overview-graph/block-overview-graph.component.ts
+++ b/frontend/src/app/components/block-overview-graph/block-overview-graph.component.ts
@@ -7,6 +7,7 @@ import TxView from './tx-view';
 import { Color, Position } from './sprite-types';
 import { Price } from '../../services/price.service';
 import { StateService } from '../../services/state.service';
+import { ThemeService } from 'src/app/services/theme.service';
 import { Subscription } from 'rxjs';
 import { defaultColorFunction, setOpacity, defaultFeeColors, defaultAuditFeeColors, defaultMarginalFeeColors, defaultAuditColors } from './utils';
 import { ActiveFilter, FilterMode, toFlags } from '../../shared/filters.utils';
@@ -55,6 +56,7 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
 
   @ViewChild('blockCanvas')
   canvas: ElementRef<HTMLCanvasElement>;
+  themeChangedSubscription: Subscription;
 
   gl: WebGLRenderingContext;
   animationFrameRequest: number;
@@ -86,6 +88,7 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
     readonly ngZone: NgZone,
     readonly elRef: ElementRef,
     public stateService: StateService,
+    private themeService: ThemeService,
   ) {
     this.webGlEnabled = this.stateService.isBrowser && detectWebGL();
     this.vertexArray = new FastVertexArray(512, TxSprite.dataSize);
@@ -104,6 +107,10 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
       if (this.gl) {
         this.initCanvas();
         this.resizeCanvas();
+        this.themeChangedSubscription = this.themeService.themeChanged$.subscribe(() => {
+          // force full re-render
+          this.resizeCanvas();
+        });
       }
     }
   }
@@ -149,6 +156,7 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
     if (this.canvas) {
       this.canvas.nativeElement.removeEventListener('webglcontextlost', this.handleContextLost);
       this.canvas.nativeElement.removeEventListener('webglcontextrestored', this.handleContextRestored);
+      this.themeChangedSubscription?.unsubscribe();
     }
   }
 
@@ -291,7 +299,7 @@ export class BlockOverviewGraphComponent implements AfterViewInit, OnDestroy, On
         this.start();
       } else {
         this.scene = new BlockScene({ width: this.displayWidth, height: this.displayHeight, resolution: this.resolution,
-          blockLimit: this.blockLimit, orientation: this.orientation, flip: this.flip, vertexArray: this.vertexArray,
+          blockLimit: this.blockLimit, orientation: this.orientation, flip: this.flip, vertexArray: this.vertexArray, theme: this.themeService,
           highlighting: this.auditHighlighting, animationDuration: this.animationDuration, animationOffset: this.animationOffset,
         colorFunction: this.getColorFunction() });
         this.start();
diff --git a/frontend/src/app/components/block-overview-graph/block-scene.ts b/frontend/src/app/components/block-overview-graph/block-scene.ts
index 5d2196f1e..853301ee7 100644
--- a/frontend/src/app/components/block-overview-graph/block-scene.ts
+++ b/frontend/src/app/components/block-overview-graph/block-scene.ts
@@ -3,12 +3,14 @@ import TxView from './tx-view';
 import { TransactionStripped } from '../../interfaces/node-api.interface';
 import { Color, Position, Square, ViewUpdateParams } from './sprite-types';
 import { defaultColorFunction } from './utils';
+import { ThemeService } from 'src/app/services/theme.service';
 
 export default class BlockScene {
   scene: { count: number, offset: { x: number, y: number}};
   vertexArray: FastVertexArray;
   txs: { [key: string]: TxView };
   getColor: ((tx: TxView) => Color) = defaultColorFunction;
+  theme: ThemeService;
   orientation: string;
   flip: boolean;
   animationDuration: number = 900;
@@ -29,11 +31,11 @@ export default class BlockScene {
   animateUntil = 0;
   dirty: boolean;
 
-  constructor({ width, height, resolution, blockLimit, animationDuration, animationOffset, orientation, flip, vertexArray, highlighting, colorFunction }:
+  constructor({ width, height, resolution, blockLimit, animationDuration, animationOffset, orientation, flip, vertexArray, theme, highlighting, colorFunction }:
       { width: number, height: number, resolution: number, blockLimit: number, animationDuration: number, animationOffset: number,
-        orientation: string, flip: boolean, vertexArray: FastVertexArray, highlighting: boolean, colorFunction: ((tx: TxView) => Color) | null }
+        orientation: string, flip: boolean, vertexArray: FastVertexArray, theme: ThemeService, highlighting: boolean, colorFunction: ((tx: TxView) => Color) | null }
   ) {
-    this.init({ width, height, resolution, blockLimit, animationDuration, animationOffset, orientation, flip, vertexArray, highlighting, colorFunction });
+    this.init({ width, height, resolution, blockLimit, animationDuration, animationOffset, orientation, flip, vertexArray, theme, highlighting, colorFunction });
   }
 
   resize({ width = this.width, height = this.height, animate = true }: { width?: number, height?: number, animate: boolean }): void {
@@ -90,7 +92,7 @@ export default class BlockScene {
     });
     this.layout = new BlockLayout({ width: this.gridWidth, height: this.gridHeight });
     txs.forEach(tx => {
-      const txView = new TxView(tx, this);
+      const txView = new TxView(tx, this, this.theme);
       this.txs[tx.txid] = txView;
       this.place(txView);
       this.saveGridToScreenPosition(txView);
@@ -136,7 +138,7 @@ export default class BlockScene {
     });
     txs.forEach(tx => {
       if (!this.txs[tx.txid]) {
-        this.txs[tx.txid] = new TxView(tx, this);
+        this.txs[tx.txid] = new TxView(tx, this, this.theme);
       }
     });
 
@@ -178,7 +180,7 @@ export default class BlockScene {
     if (resetLayout) {
       add.forEach(tx => {
         if (!this.txs[tx.txid]) {
-          this.txs[tx.txid] = new TxView(tx, this);
+          this.txs[tx.txid] = new TxView(tx, this, this.theme);
         }
       });
       this.layout = new BlockLayout({ width: this.gridWidth, height: this.gridHeight });
@@ -198,7 +200,7 @@ export default class BlockScene {
 
       // try to insert new txs directly
       const remaining = [];
-      add.map(tx => new TxView(tx, this)).sort(feeRateDescending).forEach(tx => {
+      add.map(tx => new TxView(tx, this, this.theme)).sort(feeRateDescending).forEach(tx => {
         if (!this.tryInsertByFee(tx)) {
           remaining.push(tx);
         }
@@ -228,9 +230,9 @@ export default class BlockScene {
     this.animateUntil = Math.max(this.animateUntil, tx.setHighlight(value));
   }
 
-  private init({ width, height, resolution, blockLimit, animationDuration, animationOffset, orientation, flip, vertexArray, highlighting, colorFunction }:
+  private init({ width, height, resolution, blockLimit, animationDuration, animationOffset, orientation, flip, vertexArray, theme, highlighting, colorFunction }:
       { width: number, height: number, resolution: number, blockLimit: number, animationDuration: number, animationOffset: number,
-        orientation: string, flip: boolean, vertexArray: FastVertexArray, highlighting: boolean, colorFunction: ((tx: TxView) => Color) | null }
+        orientation: string, flip: boolean, vertexArray: FastVertexArray, theme: ThemeService, highlighting: boolean, colorFunction: ((tx: TxView) => Color) | null }
   ): void {
     this.animationDuration = animationDuration || 1000;
     this.configAnimationOffset = animationOffset;
@@ -240,6 +242,7 @@ export default class BlockScene {
     this.vertexArray = vertexArray;
     this.highlightingEnabled = highlighting;
     this.getColor = colorFunction || defaultColorFunction;
+    this.theme = theme;
 
     this.scene = {
       count: 0,
diff --git a/frontend/src/app/components/block-overview-graph/tx-view.ts b/frontend/src/app/components/block-overview-graph/tx-view.ts
index 742c305f5..13de08aa6 100644
--- a/frontend/src/app/components/block-overview-graph/tx-view.ts
+++ b/frontend/src/app/components/block-overview-graph/tx-view.ts
@@ -5,6 +5,8 @@ import { hexToColor } from './utils';
 import BlockScene from './block-scene';
 import { TransactionStripped } from '../../interfaces/node-api.interface';
 import { TransactionFlags } from '../../shared/filters.utils';
+import { feeLevels } from '../../app.constants';
+import { ThemeService } from 'src/app/services/theme.service';
 
 const hoverTransitionTime = 300;
 const defaultHoverColor = hexToColor('1bd8f4');
@@ -36,6 +38,7 @@ export default class TxView implements TransactionStripped {
   status?: 'found' | 'missing' | 'sigop' | 'fresh' | 'freshcpfp' | 'added' | 'prioritized' | 'censored' | 'selected' | 'rbf' | 'accelerated';
   context?: 'projected' | 'actual';
   scene?: BlockScene;
+  theme: ThemeService;
 
   initialised: boolean;
   vertexArray: FastVertexArray;
@@ -50,7 +53,7 @@ export default class TxView implements TransactionStripped {
 
   dirty: boolean;
 
-  constructor(tx: TransactionStripped, scene: BlockScene) {
+  constructor(tx: TransactionStripped, scene: BlockScene, theme: ThemeService) {
     this.scene = scene;
     this.context = tx.context;
     this.txid = tx.txid;
@@ -66,6 +69,7 @@ export default class TxView implements TransactionStripped {
     this.bigintFlags = tx.flags ? (BigInt(tx.flags) | (this.acc ? TransactionFlags.acceleration : 0n)): 0n;
     this.initialised = false;
     this.vertexArray = scene.vertexArray;
+    this.theme = theme;
 
     this.hover = false;
 
@@ -138,10 +142,10 @@ export default class TxView implements TransactionStripped {
 
   // Temporarily override the tx color
   // returns minimum transition end time
-  setHover(hoverOn: boolean, color: Color | void = defaultHoverColor): number {
+  setHover(hoverOn: boolean, color: Color | void): number {
     if (hoverOn) {
       this.hover = true;
-      this.hoverColor = color;
+      this.hoverColor = color || this.theme.defaultHoverColor;
 
       this.sprite.update({
         ...this.hoverColor,
@@ -191,4 +195,30 @@ export default class TxView implements TransactionStripped {
     this.dirty = false;
     return performance.now() + hoverTransitionTime;
   }
+
+  getColor(): Color {
+    const feeLevelIndex = feeLevels.findIndex((feeLvl) => Math.max(1, this.feerate) < feeLvl) - 1;
+    const feeLevelColor = this.theme.feeColors[feeLevelIndex] || this.theme.feeColors[this.theme.mempoolFeeColors.length - 1];
+    // Block audit
+    switch(this.status) {
+      case 'censored':
+        return this.theme.auditColors.censored;
+      case 'missing':
+        return this.theme.auditColors.missing;
+      case 'fresh':
+        return this.theme.auditColors.missing;
+      case 'added':
+        return this.theme.auditColors.added;
+      case 'selected':
+        return this.theme.auditColors.selected;
+      case 'found':
+        if (this.context === 'projected') {
+          return this.theme.auditFeeColors[feeLevelIndex] || this.theme.auditFeeColors[this.theme.mempoolFeeColors.length - 1];
+        } else {
+          return feeLevelColor;
+        }
+      default:
+        return feeLevelColor;
+    }
+  }
 }
diff --git a/frontend/src/app/components/fees-box/fees-box.component.ts b/frontend/src/app/components/fees-box/fees-box.component.ts
index 4f9772b22..2523822f4 100644
--- a/frontend/src/app/components/fees-box/fees-box.component.ts
+++ b/frontend/src/app/components/fees-box/fees-box.component.ts
@@ -2,8 +2,9 @@ import { Component, OnInit, ChangeDetectionStrategy } from '@angular/core';
 import { StateService } from '../../services/state.service';
 import { Observable, combineLatest } from 'rxjs';
 import { Recommendedfees } from '../../interfaces/websocket.interface';
-import { feeLevels, mempoolFeeColors } from '../../app.constants';
+import { feeLevels } from '../../app.constants';
 import { map, startWith, tap } from 'rxjs/operators';
+import { ThemeService } from 'src/app/services/theme.service';
 
 @Component({
   selector: 'app-fees-box',
@@ -18,7 +19,8 @@ export class FeesBoxComponent implements OnInit {
   noPriority = '#2e324e';
 
   constructor(
-    private stateService: StateService
+    private stateService: StateService,
+    private themeService: ThemeService,
   ) { }
 
   ngOnInit(): void {
@@ -33,11 +35,11 @@ export class FeesBoxComponent implements OnInit {
         tap((fees) => {
           let feeLevelIndex = feeLevels.slice().reverse().findIndex((feeLvl) => fees.minimumFee >= feeLvl);
           feeLevelIndex = feeLevelIndex >= 0 ? feeLevels.length - feeLevelIndex : feeLevelIndex;
-          const startColor = '#' + (mempoolFeeColors[feeLevelIndex - 1] || mempoolFeeColors[mempoolFeeColors.length - 1]);
+          const startColor = '#' + (this.themeService.mempoolFeeColors[feeLevelIndex - 1] || this.themeService.mempoolFeeColors[this.themeService.mempoolFeeColors.length - 1]);
 
           feeLevelIndex = feeLevels.slice().reverse().findIndex((feeLvl) => fees.fastestFee >= feeLvl);
           feeLevelIndex = feeLevelIndex >= 0 ? feeLevels.length - feeLevelIndex : feeLevelIndex;
-          const endColor = '#' + (mempoolFeeColors[feeLevelIndex - 1] || mempoolFeeColors[mempoolFeeColors.length - 1]);
+          const endColor = '#' + (this.themeService.mempoolFeeColors[feeLevelIndex - 1] || this.themeService.mempoolFeeColors[this.themeService.mempoolFeeColors.length - 1]);
 
           this.gradient = `linear-gradient(to right, ${startColor}, ${endColor})`;
           this.noPriority = startColor;
diff --git a/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts b/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
index ed5b61f2b..0614bfec0 100644
--- a/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
+++ b/frontend/src/app/components/mempool-blocks/mempool-blocks.component.ts
@@ -4,12 +4,13 @@ import { MempoolBlock } from '../../interfaces/websocket.interface';
 import { StateService } from '../../services/state.service';
 import { Router } from '@angular/router';
 import { map, switchMap, tap } from 'rxjs/operators';
-import { feeLevels, mempoolFeeColors } from '../../app.constants';
+import { feeLevels } from '../../app.constants';
 import { specialBlocks } from '../../app.constants';
 import { RelativeUrlPipe } from '../../shared/pipes/relative-url/relative-url.pipe';
 import { Location } from '@angular/common';
 import { DifficultyAdjustment, MempoolPosition } from '../../interfaces/node-api.interface';
 import { animate, style, transition, trigger } from '@angular/animations';
+import { ThemeService } from 'src/app/services/theme.service';
 
 @Component({
   selector: 'app-mempool-blocks',
@@ -84,6 +85,7 @@ export class MempoolBlocksComponent implements OnInit, OnChanges, OnDestroy {
   constructor(
     private router: Router,
     public stateService: StateService,
+    private themeService: ThemeService,
     private cd: ChangeDetectorRef,
     private relativeUrlPipe: RelativeUrlPipe,
     private location: Location,
@@ -354,7 +356,7 @@ export class MempoolBlocksComponent implements OnInit, OnChanges, OnDestroy {
     trimmedFeeRange.forEach((fee: number) => {
       let feeLevelIndex = feeLevels.slice().reverse().findIndex((feeLvl) => fee >= feeLvl);
       feeLevelIndex = feeLevelIndex >= 0 ? feeLevels.length - feeLevelIndex : feeLevelIndex;
-      gradientColors.push(mempoolFeeColors[feeLevelIndex - 1] || mempoolFeeColors[mempoolFeeColors.length - 1]);
+      gradientColors.push(this.themeService.mempoolFeeColors[feeLevelIndex - 1] || this.themeService.mempoolFeeColors[this.themeService.mempoolFeeColors.length - 1]);
     });
 
     gradientColors.forEach((color, i, gc) => {
diff --git a/frontend/src/app/services/theme.service.ts b/frontend/src/app/services/theme.service.ts
new file mode 100644
index 000000000..2d4ba17a3
--- /dev/null
+++ b/frontend/src/app/services/theme.service.ts
@@ -0,0 +1,103 @@
+import { Injectable } from '@angular/core';
+import { audit, Subject } from 'rxjs';
+import { Color } from '../components/block-overview-graph/sprite-types';
+import { defaultMempoolFeeColors, contrastMempoolFeeColors } from '../app.constants';
+import { StorageService } from './storage.service';
+
+const defaultAuditColors = {
+  censored: hexToColor('f344df'),
+  missing: darken(desaturate(hexToColor('f344df'), 0.3), 0.7),
+  added: hexToColor('0099ff'),
+  selected: darken(desaturate(hexToColor('0099ff'), 0.3), 0.7),
+};
+const contrastAuditColors = {
+  censored: hexToColor('ffa8ff'),
+  missing: darken(desaturate(hexToColor('ffa8ff'), 0.3), 0.7),
+  added: hexToColor('00bb98'),
+  selected: darken(desaturate(hexToColor('00bb98'), 0.3), 0.7),
+};
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ThemeService {
+  style: HTMLLinkElement;
+  theme: string = 'default';
+  themeChanged$: Subject<string> = new Subject();
+  mempoolFeeColors: string[] = defaultMempoolFeeColors;
+
+  /* block visualization colors */
+  defaultHoverColor: Color;
+  feeColors: Color[];
+  auditFeeColors: Color[];
+  auditColors: { [category: string]: Color } = defaultAuditColors;
+
+  constructor(
+    private storageService: StorageService,
+  ) {
+    const theme = this.storageService.getValue('theme-preference') || 'default';
+    this.apply(theme);
+  }
+
+  apply(theme) {
+    this.theme = theme;
+    if (theme !== 'default') {
+      if (theme === 'contrast') {
+        this.mempoolFeeColors = contrastMempoolFeeColors;
+        this.auditColors = contrastAuditColors;
+      }
+      if (!this.style) {
+        this.style = document.createElement('link');
+        this.style.rel = 'stylesheet';
+        this.style.href = `theme-${theme}.css`;
+        document.head.appendChild(this.style);
+      } else {
+        this.style.href = `theme-${theme}.css`;
+      }
+    } else {
+      this.mempoolFeeColors = defaultMempoolFeeColors;
+      this.auditColors = defaultAuditColors;
+      if (this.style) {
+        this.style.remove();
+        this.style = null;
+      }
+    }
+    this.updateFeeColors();
+    this.storageService.setValue('theme-preference', theme);
+    this.themeChanged$.next(this.theme);
+  }
+
+  updateFeeColors() {
+    this.defaultHoverColor = hexToColor('1bd8f4');
+    this.feeColors = this.mempoolFeeColors.map(hexToColor);
+    this.auditFeeColors = this.feeColors.map((color) => darken(desaturate(color, 0.3), 0.9));
+  }
+}
+
+export function hexToColor(hex: string): Color {
+  return {
+    r: parseInt(hex.slice(0, 2), 16) / 255,
+    g: parseInt(hex.slice(2, 4), 16) / 255,
+    b: parseInt(hex.slice(4, 6), 16) / 255,
+    a: 1
+  };
+}
+
+export function desaturate(color: Color, amount: number): Color {
+  const gray = (color.r + color.g + color.b) / 6;
+  return {
+    r: color.r + ((gray - color.r) * amount),
+    g: color.g + ((gray - color.g) * amount),
+    b: color.b + ((gray - color.b) * amount),
+    a: color.a,
+  };
+}
+
+export function darken(color: Color, amount: number): Color {
+  return {
+    r: color.r * amount,
+    g: color.g * amount,
+    b: color.b * amount,
+    a: color.a,
+  }
+}
diff --git a/frontend/src/theme-contrast.scss b/frontend/src/theme-contrast.scss
new file mode 100644
index 000000000..48d9a1034
--- /dev/null
+++ b/frontend/src/theme-contrast.scss
@@ -0,0 +1,70 @@
+/* Theme */
+$bg: #ff1f31;
+$active-bg: #ff131f;
+$hover-bg: #ff131e;
+$fg: #ff0;
+
+/* Bootstrap */
+
+$body-bg: $bg;
+$body-color: $fg;
+$gray-800: $bg;
+$gray-700: $fg;
+
+$nav-tabs-link-active-bg: $active-bg;
+
+$primary: #105fb0;
+$secondary: #2d3348;
+$tertiary: #653b9c;
+$success: #1a9436;
+$info: #1bd8f4;
+
+$h5-font-size: 1.15rem !default;
+
+$pagination-bg: $body-bg;
+$pagination-border-color: $gray-800;
+$pagination-disabled-bg:           $fg;
+$pagination-disabled-border-color: $bg;
+$pagination-active-color:          $fg;
+$pagination-active-bg:             $tertiary;
+$pagination-hover-bg:              $hover-bg;
+$pagination-hover-border-color:     $bg;
+$pagination-disabled-bg:          $bg;
+
+$custom-select-indicator-color: $fg;
+
+.input-group-text {
+  background-color: #1c2031 !important;
+  border: 1px solid #20263e !important;
+}
+
+$link-color:                $info;
+$link-decoration:           none !default;
+$link-hover-color:          darken($link-color, 15%) !default;
+$link-hover-decoration:     underline !default;
+
+$dropdown-bg: $bg;
+$dropdown-link-color: $fg;
+
+$dropdown-link-hover-color: $fg;
+$dropdown-link-hover-bg: $active-bg;
+
+$dropdown-link-active-color: $fg;
+$dropdown-link-active-bg: $active-bg;
+
+@import "~bootstrap/scss/bootstrap";
+
+:root {
+  --bg: #{$bg};
+  --active-bg: #{$active-bg};
+  --hover-bg: #{$hover-bg};
+  --fg: #{$fg};
+
+  --primary: #{$primary};
+  --secondary: #{$secondary};
+  --tertiary: #{$tertiary};
+  --success: #{$success};
+  --info: #{$info};
+
+  --box-bg: var(--box-bg);
+}
\ No newline at end of file