Icons to network dropdown.

frontend/src/app/components/master-page/master-page.component.html

@@ -11,10 +11,10 @@
       <span class="sr-only">Toggle Dropdown</span>
     </button>
     <div class="dropdown-menu" [class.d-block]="!networkDropdownHidden">
-      <a class="dropdown-item mainnet" [class.active]="network === ''" routerLink="/">Mainnet</a>
-      <a class="dropdown-item liquid" [class.active]="network === 'liquid'" routerLink="/liquid">Liquid</a>
-      <a class="dropdown-item testnet" [class.active]="network === 'testnet'" routerLink="/testnet">Testnet</a>
-      </div>
+      <a class="dropdown-item mainnet" [class.active]="network === ''" routerLink="/"><img src="./resources/bitcoin-logo.png" style="width: 35.5px;"> Mainnet</a>
+      <a class="dropdown-item liquid" [class.active]="network === 'liquid'" routerLink="/liquid"><img src="./resources/liquid-logo.png" style="width: 35.5px;"> Liquid</a>
+      <a class="dropdown-item testnet" [class.active]="network === 'testnet'" routerLink="/testnet"><img src="./resources/testnet-logo.png" style="width: 35.5px;"> Testnet</a>
+    </div>
   </div>
 
   <button class="navbar-toggler" type="button" (click)="collapse()" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">