injectCSS.js

(function() {
    function addCSS(css){
        let head = document.getElementsByTagName('head')[0] || document.getElementsByTagName('html')[0];
        if (!head) {
            return;
        }
        let style = document.createElement('style');
        style.type = 'text/css';
        style.innerHTML = css;
        head.appendChild(style);
    }

    addCSS(`
.CodeMirror-code .cm-variable-2 {
    color: #9bf0f9;
}

.CodeMirror-code .cm-def {
    color: #76f3b5;
}

.CodeMirror-code .cm-meta {
    color: #9ea9ff;
}

.CodeMirror-code .cm-keyword {
    color: #ad89e4;
}

.CodeMirror-code .cm-operator {
    color: #ff6897;
}

.CodeMirror-code .cm-property {
    color: #7d9eff;
}

.CodeMirror-code .cm-string-2{
    color: #ff8762;
}
    `);
})();