btcpayserver/BTCPayServer/Views/Shared/LayoutHeadStoreBranding.cshtml

@model (string BrandColor, string CssFileId, string CustomCSSLink, string EmbeddedCSS)
@using BTCPayServer.Abstractions.Extensions
@using Microsoft.AspNetCore.Mvc.TagHelpers
@using BTCPayServer.Abstractions.Contracts
@inject IFileService FileService
@{
    var cssUrl = !string.IsNullOrEmpty(Model.CssFileId)
        ? await FileService.GetFileUrl(Context.Request.GetAbsoluteRootUri(), Model.CssFileId)
        : null;
}
@if (!string.IsNullOrEmpty(Model.BrandColor))
{
    var brand = Model.BrandColor;
    var brandColor = ColorPalette.Default.FromHtml(brand);
    var brandRgbValues = $"{brandColor.R}, {brandColor.G}, {brandColor.B}";
    var accent = ColorPalette.Default.AdjustBrightness(brand, (float)-0.15);
    var complement = ColorPalette.Default.TextColor(brand);
    var complementVar = $"var(--btcpay-{(complement == "black" ? "black" : "white")})";
    <style>
        :root {
            --btcpay-primary: @brand;
            --btcpay-primary-rgb: @brandRgbValues;
            --btcpay-primary-shadow: @brand;
            --btcpay-primary-bg-hover: @accent;
            --btcpay-primary-bg-active: @accent;
            --btcpay-body-link: @brand;
            --btcpay-body-link-accent: @accent;
            --btcpay-primary-text: @complementVar;
            --btcpay-primary-text-hover: @complementVar;
            --btcpay-primary-text-active: @complementVar;
        }
        a {
            color: var(--btcpay-body-link);
        }
        a:hover {
            color: var(--btcpay-body-link-accent);
        }
    </style>
}
@if (!string.IsNullOrEmpty(cssUrl))
{
    <link href="@cssUrl" asp-append-version="true" rel="stylesheet" />
}
@* Deprecated, but added for backwards-compatibility *@
@if (!string.IsNullOrEmpty(Model.CustomCSSLink))
{
    <link href="@Model.CustomCSSLink" asp-append-version="true" rel="stylesheet" />
}
@if (!string.IsNullOrEmpty(Model.EmbeddedCSS))
{
    <style>
        @Safe.Raw(Model.EmbeddedCSS)
    </style>
}