#editor {
            border: 1px solid #ccc;
            padding: 10px;
            min-height: 150px;
        }
        .change-insert { background-color: #d4edda; border-bottom: 1px dashed #155724; }
        .change-delete { background-color: #f8d7da; text-decoration: line-through; border-bottom: 1px dashed #721c24; }