hugo-tufte/assets/scss/syntax/highlight-dark.scss

$ht-code-bgcolor: #282a36;

@import "syntax-dark.scss";

.highlight {
    &::-webkit-scrollbar {
        background: $ht-code-bgcolor;
    }
    &::-webkit-scrollbar-thumb {
        background: scale-color($ht-code-bgcolor, $lightness: 23%, $saturation: -40%);
    }
}