* {
				margin: 0;
				padding: 0;
			}

			.app {
				display: flex;
			}

			.left,
			.right {
				position: absolute;
				top:0;
				bottom:0;
				left:0;
				-webkit-user-select: none;
			}
			.left{
				width: 50%;
			}
			.right{
				left:50%;
				right:0;
			}
			.line {
				position: absolute;
				top: 0;
				bottom: 0;
				width: 4px;
				background: #ddd;
				left: 50%;
				margin-left: -2px;
				z-index: 999;
				cursor: col-resize;
			}