梯形
.box {
width: 100px;
border-bottom: 100px solid sandybrown;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
}
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.box {
width: 100px;
border-bottom: 100px solid sandybrown;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
}