#editor-container{flex:1}#preview-container{flex:1;border:1px solid #ccc;padding:10px}#variable-list{margin-top:10px}.var-btn{margin:0 5px 5px 0;padding:5px 10px;background:#007bff;color:#fff;border:none;cursor:pointer}.var-btn:hover{background:#0056b3}.toolbar{margin-bottom:10px}