CSS两列布局body { margin: 0; padding: 0; } .left { float: left; width: 20%; background-color: #f8f8f8; height: 100vh; } .right { float: left; width: 80%; padding: 20px; background-color: #fff; height: 100vh; } h1 { font-size: 30px; margin-bottom: 20px; } p { font-size: 18px; line-height: 1.5; margin-bottom: 20px; text-indent: 2em; } pre { background-color: #f8f8f8; padding: 10px; }

.left {
	float: left;
	width: 20%;
}
.right {
	float: left;
	width: 80%;
}