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108CSS3效果:太极图

方法一:三层div实现。思路:(1)通过渐变把外层圆形div的content分成上下黑白两个区域;(2)用中间层两个圆形div的content颜色来改变本区域的颜色;(3)用内层两个圆形div的content颜色来恢复本区域的颜色。鼠标置于太极图上,太极图还会旋转!**css 代码**```css:run<!DOCTYPE html><html><head>    <Meta charset="UTF-8">    <title>太极</title>    <style class="cp-pen-styles">       *{           padding:0;           margin:0;       }       .outer{           background: linear-gradient(to bottom,white 50%,black 50%);           margin:100px auto;           width:200px;           height:200px;           border-radius: 50%;           position:relative;           border:1px solid black;           transition: all 5s ease;       }       .outer:hover{           transform: rotate(360deg) scale(1.5);       }       .outer .left{           background: white;           width:100px;           height:100px;           border-radius: 50%;           position:absolute;           left: 0;           top:50px;       }       .outer .left .leftInner{           background: black;           width:40px;           height:40px;           border-radius: 50%;           position:absolute;           left: 30px;           top:30px;       }       .outer .right{           background: black;           width:100px;           height:100px;           border-radius: 50%;           position:absolute;           right: 0;           top:50px;       }       .outer .right .rightInner{           background: white;           width:40px;           height:40px;           border-radius: 50%;           position:absolute;           left:30px;           top:30px;       }    </style></head><body><div class="outer">    <div class="left">        <div class="leftInner"></div>    </div>    <div class="right">        <div class="rightInner"></div>    </div></div></body></html>```方法二:伪类实现。思路:(1)通过渐变把外层圆形div分成上下黑白两个区域;(2)添加伪类,用伪类的圆形边框颜色来改变本区域的颜色;(3)通过伪类的圆形content颜色来恢复本区域的颜色。鼠标置于太极图上,太极图还会旋转!**html 代码**```html:run<!DOCTYPE html><html><head>    <Meta charset="UTF-8">    <title>太极</title>    <style>        *{            margin:0;            padding:0;        }        div,:before,:after {            Box-sizing: border-Box;        }        #taiji {            position: absolute;            top: 50%;            left: 50%;            width: 200px;            height: 200px;            margin: -100px 0 0 -100px;            background: linear-gradient(0deg,black 50%,white 50%);            border-radius: 50%;            border:1px black solid;        }        @keyframes taiji {            from{                transform: rotate(0deg) scale(1);            }            to{                transform: rotate(360deg) scale(2);            }        }        #taiji:hover {            animation: taiji 1s ease 0s infinite;        }        #taiji:before,#taiji:after {            content: "";            display: block;            position: absolute;            width: 50%;            height: 50%;            top: 25%;            border-radius: 50%;            border: 35px solid transparent;        }        #taiji:before {            left: 0;            border-color: black;            background-color: white;        }        #taiji:after {            right: 0;            border-color: white;            background-color: black;        }    </style></head><body><div id="taiji"></div></body></html>```

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