效果图如下所示：
直接上代码！
<!DOCTYPE html>
<html lang="en">
<head>
<title>小三角</title>
<style>
.up-triangle{
width:0px;
height:0px;
border-bottom:30px solid #000;
border-left:15px solid transparent;
border-right:15px solid transparent;
margin:100px auto;
}
.down-triangle{
width:0px;
height:0px;
border-top:30px solid #000;
border-left:15px solid transparent;
border-right:15px solid transparent;
margin:100px auto;
}
.left-triangle{
width:0px;
height:0px;
border-right:30px solid #000;
border-top:15px solid transparent;
border-bottom:15px solid transparent;
margin:100px auto;
}
.right-triangle{
width:0px;
height:0px;
border-left:30px solid #000;
border-top:15px solid transparent;
border-bottom:15px solid transparent;
margin:100px auto;
}
</style>
</head>
<body>
<p class="up-triangle"></p>
<p class="down-triangle"></p>
<p class="left-triangle"></p>
<p class="right-triangle"></p>
</body>
</html>
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