css如何设置圆角

.box2{

width:200px;

height:300px;

margin: 30px auto;

border: 2px solid #e4007e;

text-align: center;

line-height: 200px;

font-weight: bold;

font-size: 24px;

background: burlywood;

border-radius: 100px/150px;

}

#box4{

width:500px;

position: relative;

margin:30px auto;

}

.div4,.div5,.div6,.div7{

width:200px;

height:200px;

text-align: center;

color:seagreen;

font-size: 26px;

line-height: 200px;

background: yellowgreen;

border:2px solid darkslategray;

float:left;

margin:20px;

}

.div4{border-top-left-radius: 40px;}

.div5{border-top-right-radius: 20px;}

.div6{border-bottom-left-radius: 30px;}

.div7{border-bottom-right-radius: 10px;}