我怎么能复制这个?
.top-left {
position: absolute;
background: black;
height: 3px;
width: 4rem;
top: 0;
left: 0;
border-top-left-radius: 150px;
}
.left-top {
position: absolute;
background: black;
height: 4rem;
width: 3px;
top: 0;
left: 0;
border-bottom-left-radius: 150px;
}
<div class="top-left"></div>
<div class="left-top"></div>