styles.css

/* css styles */
code.sourceCode.r::before{
    content:url('data:image/svg+xml; utf8, <svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M12 2.746c-6.627 0-12 3.599-12 8.037 0 3.897 4.144 7.144 9.64 7.88V16.26c-2.924-.915-4.925-2.755-4.925-4.877 0-3.035 4.084-5.494 9.12-5.494 5.038 0 8.757 1.683 8.757 5.494 0 1.976-.999 3.379-2.662 4.272.09.066.174.128.258.216.169.149.25.363.372.544 2.128-1.45 3.44-3.437 3.44-5.631 0-4.44-5.373-8.038-12-8.038zm-2.111 4.99v13.516l4.093-.002-.002-5.291h1.1c.225 0 .321.066.549.25.272.22.715.982.715.982l2.164 4.063 4.627-.002-2.864-4.826s-.086-.193-.265-.383a2.22 2.22 0 00-.582-.416c-.422-.214-1.149-.434-1.149-.434s3.578-.264 3.578-3.826c0-3.562-3.744-3.63-3.744-3.63zm4.127 2.93l2.478.002s1.149-.062 1.149 1.127c0 1.165-1.149 1.17-1.149 1.17h-2.478zm1.754 6.119c-.494.049-1.012.079-1.54.088v1.807a16.622 16.622 0 002.37-.473l-.471-.891s-.108-.183-.248-.394c-.039-.054-.08-.098-.111-.137z"/></svg>');
    float:right;
    width: 20px;
    filter: opacity(0.25);
    margin-right: 20px;
}
code.sourceCode.python::before{
    content:url('data:image/svg+xml; utf8, <svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M14.25.18l.9.2.73.26.59.3.45.32.34.34.25.34.16.33.1.3.04.26.02.2-.01.13V8.5l-.05.63-.13.55-.21.46-.26.38-.3.31-.33.25-.35.19-.35.14-.33.1-.3.07-.26.04-.21.02H8.77l-.69.05-.59.14-.5.22-.41.27-.33.32-.27.35-.2.36-.15.37-.1.35-.07.32-.04.27-.02.21v3.06H3.17l-.21-.03-.28-.07-.32-.12-.35-.18-.36-.26-.36-.36-.35-.46-.32-.59-.28-.73-.21-.88-.14-1.05-.05-1.23.06-1.22.16-1.04.24-.87.32-.71.36-.57.4-.44.42-.33.42-.24.4-.16.36-.1.32-.05.24-.01h.16l.06.01h8.16v-.83H6.18l-.01-2.75-.02-.37.05-.34.11-.31.17-.28.25-.26.31-.23.38-.2.44-.18.51-.15.58-.12.64-.1.71-.06.77-.04.84-.02 1.27.05zm-6.3 1.98l-.23.33-.08.41.08.41.23.34.33.22.41.09.41-.09.33-.22.23-.34.08-.41-.08-.41-.23-.33-.33-.22-.41-.09-.41.09zm13.09 3.95l.28.06.32.12.35.18.36.27.36.35.35.47.32.59.28.73.21.88.14 1.04.05 1.23-.06 1.23-.16 1.04-.24.86-.32.71-.36.57-.4.45-.42.33-.42.24-.4.16-.36.09-.32.05-.24.02-.16-.01h-8.22v.82h5.84l.01 2.76.02.36-.05.34-.11.31-.17.29-.25.25-.31.24-.38.2-.44.17-.51.15-.58.13-.64.09-.71.07-.77.04-.84.01-1.27-.04-1.07-.14-.9-.2-.73-.25-.59-.3-.45-.33-.34-.34-.25-.34-.16-.33-.1-.3-.04-.25-.02-.2.01-.13v-5.34l.05-.64.13-.54.21-.46.26-.38.3-.32.33-.24.35-.2.35-.14.33-.1.3-.06.26-.04.21-.02.13-.01h5.84l.69-.05.59-.14.5-.21.41-.28.33-.32.27-.35.2-.36.15-.36.1-.35.07-.32.04-.28.02-.21V6.07h2.09l.14.01zm-6.47 14.25l-.23.33-.08.41.08.41.23.33.33.23.41.08.41-.08.33-.23.23-.33.08-.41-.08-.41-.23-.33-.33-.23-.41-.08-.41.08z"/></svg>');
    float:right;
    width: 20px;
    filter: opacity(0.25);
    margin-right: 20px;
}
code.sourceCode.julia::before{
    content:url('data:image/svg+xml; utf8, <svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M11.138 17.569a5.569 5.569 0 1 1-11.138 0 5.569 5.569 0 1 1 11.138 0zm6.431-11.138a5.569 5.569 0 1 1-11.138 0 5.569 5.569 0 1 1 11.138 0zM24 17.569a5.569 5.569 0 1 1-11.138 0 5.569 5.569 0 1 1 11.138 0z"/></svg>');
    float:right;
    width: 20px;
    filter: opacity(0.25);
    margin-right: 20px;
}