How to write a right triangle in css

How to write a right triangle in css: first create an HTML sample file; then remove the width of the base to achieve an isosceles right triangle; finally widen the width of the upper side to achieve the desired right triangle.

The operating environment of this tutorial: Windows7 system, HTML5&&CSS3 version, Dell G3 computer.

Use css to write a right triangle

<style>
/*原理：第一步*/
.box1{
	width: 0;
	height: 0;
	border-top: 50px solid green;
	border-right: 50px solid red;
	border-bottom: 0px solid yellow; /*1.底边去除就变成直角三角形*/
	border-left: 50px solid blue;
}

/*原理：第二步*/
.box2{
	width: 0;
	height: 0;
	border-top: 100px solid green; /*2.上边拉长就会变成直接三角形*/
	border-right: 50px solid red;
	border-bottom: 0px solid yellow; /*1.底边去除就变成直角三角形*/
	border-left: 50px solid blue;
}

/*实现*/
.box{
	width: 0;/*1.设置宽高为0*/
	height: 0;
	/*2.除右边都变透明色，实边*/
	border-color: transparent red transparent transparent;
	border-style: solid;
	border-width: 100px 50px 0 0; /*3.上边宽100，右边宽50，下左边宽0*/

}
</style>
原理第一步，去除底边宽度，实现等腰直角三角形：
<p></p>
原理第二步，加宽上边宽度，实现想要直角三角形：
<p></p>
实现，把上边，左边边变透明色：
<p></p>

[Recommended: "css video tutorial"]

Effect:

Principle The first step is to remove the base width and realize an isosceles right triangle :

Principle The second step is to widen the width of the upper side to realize the right triangle you want:

Achieve, The top and left sides become transparent:

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