<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
/*上箭头*/
.triangle-up {
width:0;
height:0;
border:10px solid transparent;
border-bottom-color:yellow;
}
/*下箭头*/
.triangle-down {
width:0;
height:0;
/*transform: translate(-50%,-50%);*/
border:10px solid transparent;
border-top-color:yellow;
}
/*左箭头*/
.triangle-left {
width:0;
height:0;
border:10px solid transparent;
border-right-color:yellow;
}
/*右箭头*/
.triangle-right {
width:0;
height:0;
/*transform: translate(-50%,0);*/
border:10px solid transparent;
border-left-color:yellow;
}
</style>
</head>
<body>
<div class="triangle-right"></div>
</body>
</html>
