Other directions can be generated by changing the direction
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
div{
width: 300px;
height: 300px;
/*添加渐变：渐变不是一个单一钩，它产生的是图像，所以需要使用background*/
/*linear-gradient(方向，开始颜色 位置，颜色2 位置，颜色3 位置...);*/
/*方向：
to top:0deg
to right:90deg
to bottom:180deg --默认值
to left:270deg*/
/*background: linear-gradient(to right,red,blue)*/;
/*background: linear-gradient(to right,red 0%,red 50%,blue 50%,blue 100%);*/
background: linear-gradient(45deg,blue 0%,blue 50%);
}
div::after {
content: '';
/*right: -11px;*/
top: 283px;
position: absolute;
height: 50px;
width: 50px;
/*生成三角形箭头
background: linear-gradient(135deg, red 0%,red 50%,transparent 50%,transparent 100%);
//转变三角形箭头指向
transform: rotate(225deg);
}
</style>
</head>
<body>
<div></div>
</body>
</html>
