How to draw a triangle
To draw a triangle using CSS is to make all four sides transparent and then set the color of one side
<style>
#div1{
margin:200px auto;
width:0px;
height:0px;
border:solid 100px transparent;
border-bottom-color:#000000
}
<style>
<body>
<div id="div1">
</div>
<body>
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