aspnet-ej1-demos/Content/SourceTabFormatter.css

/* Source code tab design classes*/
.csharpcode, .csharpcode pre {
    color: #a11;
    background-color: Transparent; /*white-space: pre;*/
    border: 1px solid Transparent;
}

    .csharpcode pre {
        margin: 0em;
    }

    .csharpcode .rem {
        color: #5c5c5c;
    }

    .csharpcode .kwrd {
        color: #170;
    }

    .csharpcode .str {
        color: #006080;
    }

    .csharpcode .op {
        color: #0000c0;
    }

    .csharpcode .preproc {
        color: #cc6633;
    }

    .csharpcode .asp {
        background-color: #ffff00;
    }

    .csharpcode .html {
        color: #170;
    }

    .csharpcode .attr {
        color: #00c;
    }

    .csharpcode .alt {
        background-color: #f4f4f4;
        width: 100%;
        margin: 0em;
    }

    .csharpcode .lnum {
        color: #606060;
    }

    /*dark theme*/
   .darktheme .csharpcode,.darktheme .csharpcode pre {
    color: #61CE3C;
    background-color: Transparent; /*white-space: pre;*/
    border: 1px solid Transparent;
}

    .darktheme .csharpcode pre {
        margin: 0em;
    }

   .darktheme .csharpcode .rem {
        color: #FF6400;
    }

   .darktheme .csharpcode .kwrd {
        color: white;
    }

   .darktheme .csharpcode .str {
        color: #006080;
    }

   .darktheme .csharpcode .op {
        color: #0000c0;
    }

   .darktheme .csharpcode .preproc {
        color: #cc6633;
    }

   .darktheme .csharpcode .asp {
        background-color: #ffff00;
    }

   .darktheme .csharpcode .html {
        color: #8DA6CE;
    }

  .darktheme  .csharpcode .attr {
        color: #8DA6CE;
    }

  .darktheme  .csharpcode .alt {
        background-color: #f4f4f4;
        width: 100%;
        margin: 0em;
    }

   .darktheme .csharpcode .lnum {
        color: #606060;
    }