body {
background-color: #f2f2f2;
.太極 {
position: relative;
width: 200px;
height: 200px;
background-size: cover;
background-position: center;
z-index: 1;
.太極:before,
.太極:after {
content: "";
position: absolute;
top: 0;
left: 50%;
width: 50%;
height: 100%;
background-color: #fff;
transform: translateX(-50%);
z-index: 2;
.太極:before {
left: 100px;
.太極:after {
left: 0;