lovecoding
/
W250913


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1{
            width: 200px;
            height: 200px;
            border:3px dashed blue
        }
        .box2{
            width: 200px;
            height: 200px;
            background-color: red;
        }
        /* 块元素在不设置高宽的情况下 */
        /* 宽度默认是父元素的宽度 */
        /* 高度默认是内容的高度 */
        /* .box3{
            background-color: red; */
            /* padding: 100px 0; */
            /* padding-top: 200px;
        } */
        .box3{
            border:100px solid black;
        } 

        .box4{
            width: 200px;
            height: 200px;
            background-color: green;
            /* border-radius: 100px; */
            /* 圆角是可以使用百分比 百分比相较于父元素的宽度 */
            /* 百分比一般使用在未知元素尺寸的情况下 */
            border-radius: 50%;
        }

        .box5{
            border-top:100px solid transparent;
            border-left: 100px solid green;
            border-bottom: 100px solid transparent;
            border-right: 100px solid transparent;
        }
        .box6{
            width: 0;
            border-top:100px solid transparent;
            border-left: 100px solid transparent;
            border-bottom: 100px solid blue;
            border-right: 100px solid transparent;
        }
    </style>
</head>
<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
    <div class="box1">
        <div class="box3"></div>
    </div>

    <div class="box4"></div>

    <div class="box5"></div>

    <div class="box6"></div>
</body>
</html>