website/static/css/editor.css

.line-error {
    background: #ff0000;
}

.editor-group {
    display: flex;
    flex-direction: row;
}

/*.editor-container {*/
/*    flex-basis: 50%;*/
/*    border-left: 1px solid #ddd;*/
/*    border-bottom: 1px solid #ddd;*/
/*    margin-left: -1px;*/
/*}*/
/*.editor-container .with-border {*/
/*    border-left: 1px solid #ddd;*/
/*    border-bottom: 1px solid #ddd;*/
/*}*/

.editor-container {
    flex-basis: 50%;
    /*    border-bottom: 1px solid #ddd;*/

}