A syntax highlighting theme for use with embeded gists based off of Smooth Yellow: https://github.com/MaxMcKinney/Smooth-Yellow-Theme

smooth-yellow-gist.css

.gist .pl-e, .gist .pl-en {
    color: #FD971F !important;
}

.gist .pl-c1, .gist .pl-s .pl-v {
    color: #B4C2D6 !important;
}

.gist .pl-s, .gist .pl-pds, .gist .pl-s .pl-pse .pl-s1, .gist .pl-sr, .gist .pl-sr .pl-cce, .gist .pl-sr .pl-sre, .gist .pl-sr .pl-sra {
    color: #B4C2D6 !important;
}

.gist .gist-meta {
    padding: 10px;
    overflow: hidden;
    font: 12px -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    color: #9a9a9a !important;
    background-color: #f4f4f4 !important;
    border-radius: 0;
}

.gist .gist-data {
    overflow: auto;
    word-wrap: normal;
    background-color: #22252A !important;
    border-bottom: none;
    border-radius: 0px !important;
}

.gist .highlight {
    padding: 0;
    margin: 0;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    font-size: 12px;
    font-weight: normal;
    line-height: 1.4;
    color: #fff !important;
    background: #22252A !important;
    border: 0;
}

.gist .blob-code-inner {
    color: #fff !important;
}

.gist .pl-e, .gist .pl-en {
    color: #FD971F !important;
}

.gist .pl-k {
    color: #ffc107 !important;
}

.gist .blob-num {
    color: rgba(169, 169, 169, 0.35) !important;
}