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<div class="box-taiji">    <div class="circle-01"></div>    <div class="circle-02"></div></div>

.box-taiji {width:400px;height:400px;position:relative;margin:50px auto;border-radius:400px;background-color:#000;box-shadow:0 0 50px rgba(0,0,0,.8);}

.box-taiji {width:400px;height:400px;position:relative;margin:50px auto;border-radius:400px;background-color:#000;box-shadow:0 0 50px rgba(0,0,0,.8);}.box-taiji:before,.box-taiji:after {width:200px;height:400px;position:absolute;top:0;display:block;content:"";}.box-taiji:before {left:0;border-radius:200px 0 0 200px;background-color:#000;}.box-taiji:after {right:0;border-radius:0 200px 200px 0;background-color:#fff;}

.box-taiji {width:400px;height:400px;position:relative;margin:50px auto;border-radius:400px;background-color:#000;box-shadow:0 0 50px rgba(0,0,0,.8);}.box-taiji:before,.box-taiji:after {width:200px;height:400px;position:absolute;top:0;display:block;content:"";}.box-taiji:before {left:0;border-radius:200px 0 0 200px;background-color:#000;}.box-taiji:after {right:0;border-radius:0 200px 200px 0;background-color:#fff;}.circle-01,.circle-02 {width:200px;height:200px;position:absolute;z-index:2;border-radius:300px;}.circle-01 {top:0;left:100px;background-color:#000;}

.box-taiji {width:400px;height:400px;position:relative;margin:50px auto;border-radius:400px;background-color:#000;box-shadow:0 0 50px rgba(0,0,0,.8);}.box-taiji:before,.box-taiji:after {width:200px;height:400px;position:absolute;top:0;display:block;content:"";}.box-taiji:before {left:0;border-radius:200px 0 0 200px;background-color:#000;}.box-taiji:after {right:0;border-radius:0 200px 200px 0;background-color:#fff;}.circle-01,.circle-02 {width:200px;height:200px;position:absolute;z-index:2;border-radius:300px;}.circle-01 {top:0;left:100px;background-color:#000;}.circle-02 {bottom:0;right:100px;background-color:#fff;}

.box-taiji {width:400px;height:400px;position:relative;margin:50px auto;border-radius:400px;background-color:#000;box-shadow:0 0 50px rgba(0,0,0,.8);}.box-taiji:before,.box-taiji:after {width:200px;height:400px;position:absolute;top:0;display:block;content:"";}.box-taiji:before {left:0;border-radius:200px 0 0 200px;background-color:#000;}.box-taiji:after {right:0;border-radius:0 200px 200px 0;background-color:#fff;}.circle-01,.circle-02 {width:200px;height:200px;position:absolute;z-index:2;border-radius:300px;}.circle-01 {top:0;left:100px;background-color:#000;}.circle-02 {bottom:0;right:100px;background-color:#fff;}.circle-01:after,.circle-02:after {width:75px;height:75px;position:absolute;z-index:3;display:block;content:"";border-radius:75px;}.circle-01:after {top:60px;left:55px;background-color:#fff;}.circle-02:after {bottom:60px;right:55px;background-color:#000;}

.box-taiji {width:400px;height:400px;position:relative;margin:50px auto;border-radius:400px;background-color:#000;box-shadow:0 0 50px rgba(0,0,0,.8);animation:rotation 2.5s linear infinite;-webkit-animation:rotation 2.5s linear infinite;-moz-animation:rotation 2.5s linear infinite;}.box-taiji:before,.box-taiji:after {width:200px;height:400px;position:absolute;top:0;display:block;content:"";}.box-taiji:before {left:0;border-radius:200px 0 0 200px;background-color:#000;}.box-taiji:after {right:0;border-radius:0 200px 200px 0;background-color:#fff;}.circle-01,.circle-02 {width:200px;height:200px;position:absolute;z-index:2;border-radius:300px;}.circle-01 {top:0;left:100px;background-color:#000;}.circle-02 {bottom:0;right:100px;background-color:#fff;}.circle-01:after,.circle-02:after {width:75px;height:75px;position:absolute;z-index:3;display:block;content:"";border-radius:75px;}.circle-01:after {top:60px;left:55px;background-color:#fff;}.circle-02:after {bottom:60px;right:55px;background-color:#000;}@keyframes rotation {    0% {transform:rotate(0deg);}    100% {transform:rotate(360deg);}}@-webkit-keyframes rotation {    0% {-webkit-transform:rotate(0deg);}    100% {-webkit-transform:rotate(360deg);}}@-moz-keyframes rotation {    0% {-moz-transform:rotate(0deg);}    100% {-moz-transform:rotate(360deg);}}

<!doctype html><html><head><meta charset="utf-8"><title>CSS3繪制旋轉(zhuǎn)的太極圖案</title><style>body {background-color:#555;}.box-taiji {width:400px;height:400px;position:relative;margin:50px auto;border-radius:400px;background-color:#000;box-shadow:0 0 50px rgba(0,0,0,.8);animation:rotation 2.5s linear infinite;-webkit-animation:rotation 2.5s linear infinite;-moz-animation:rotation 2.5s linear infinite;}.box-taiji:before,.box-taiji:after {width:200px;height:400px;position:absolute;top:0;display:block;content:"";}.box-taiji:before {left:0;border-radius:200px 0 0 200px;background-color:#000;}.box-taiji:after {right:0;border-radius:0 200px 200px 0;background-color:#fff;}.circle-01,.circle-02 {width:200px;height:200px;position:absolute;z-index:2;border-radius:300px;}.circle-01 {top:0;left:100px;background-color:#000;}.circle-02 {bottom:0;right:100px;background-color:#fff;}.circle-01:after,.circle-02:after {width:75px;height:75px;position:absolute;z-index:3;display:block;content:"";border-radius:75px;}.circle-01:after {top:60px;left:55px;background-color:#fff;}.circle-02:after {bottom:60px;right:55px;background-color:#000;}@keyframes rotation {    0% {transform:rotate(0deg);}    100% {transform:rotate(360deg);}}@-webkit-keyframes rotation {    0% {-webkit-transform:rotate(0deg);}    100% {-webkit-transform:rotate(360deg);}}@-moz-keyframes rotation {    0% {-moz-transform:rotate(0deg);}    100% {-moz-transform:rotate(360deg);}}</style></head><body><div class="box-taiji">    <div class="circle-01"></div>    <div class="circle-02"></div></div></body></html>