可以通过border的transparent来画
代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box {
width: 100px;
height: 100px;
/* background-color: transparent; */
border: 50px solid transparent;
/* border-right-color: blue;
border-bottom-color: aqua;
border-left-color: blueviolet; */
/* border-right-color: transparent;
border-bottom-color: transparent;
border-left-color: transparent; */
border-top-color: orange;
box-sizing: border-box;
/* 旋转 */
transform-origin: center 25%;
transform: rotate(180deg);
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>