lovecoding
/
W260426


			
				
					
						
						
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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>
        .box{
            width: 200px;
            height: 200px;
            background-color: red;
        }
        .circle{
            width: 200px;
            height: 200px;
            background-color: red;
            /* 圆形 在正方形基础上设置圆角 50% 就是圆 就是当前元素的一半 */
            border-radius: 50%;
        }
        .triangle{
            width: 0px;
            height: 0px;
            /* border:50px solid black; */
            border-top:50px solid rgba(0, 0, 0, 0);
            /* transparent 表示透明色 */
            border-left:50px solid transparent;
            border-bottom:50px solid transparent;
            border-right:50px solid yellow;
        }
    </style>
</head>
<body>
    <!-- 正方形 -->
    <!-- <div class="box"></div> -->
    <!-- 圆形 -->
     <!-- <div class="circle"></div> -->
     <!-- 三角形 -->
      <div class="triangle"></div>
</body>
</html>