.CodeMirror-line.error { background: rgba(255, 0, 0, 0.2); } .cm-s-default .cm-keyword {color: #0055CC;} .cm-s-default .cm-variable {color: #AA5500;} .cm-s-default .cm-operator {color: #0055CC;} .cm-s-default .cm-comment {color: #558800;} .cm-s-default .cm-string {color: #221111;} .cm-s-default .cm-error {color: #FF0000;} .cm-s-default .cm-trailingspace { background: rgba(255, 0, 0, 0.2); }