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before :after how to output a small triangle

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Release: 2018-03-20 13:56:51
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This time I will show you how to output a small triangle before :after, what are the precautions for before :after to output a small triangle, the following is a practical case, let's take a look.

The triangles written before are always in the same color and have no border style. As follows:

The CSS code is as follows:

.tri-up{width: 0;height:0;border-left:20px solid transparent;border-right: 20px solid transparent;border-bottom: 20px solid red;  }
.tri-left{width: 0;height:0;border-top:20px solid transparent;border-bottom: 20px solid transparent;border-left: 20px solid red;}
.tri-right{width: 0;height:0;border-top:20px solid transparent;border-bottom: 20px solid transparent;border-right: 20px solid red;}
.tri-down{width: 0;height:0;border-left:20px solid transparent;border-right: 20px solid transparent;border-top: 20px solid red; }
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If you want to write the following small triangle, you need to use the pseudo class

:before :after

CSS code:

#demo {
            margin: 100px;;
            width: 100px;
            height: 100px;
            background-color: #fff;
            position: relative;
            border: 2px solid #333;
        } //方框的样式
        #demo:after, #demo:before {
            border: solid transparent;
            content: ' ';
            height: 0;
            left: 100%;    //根据三角形的位置,可以随意更改。
            position: absolute;
            width: 0;
        } 
        #demo:after {
            border-width: 10px;
            border-left-color: #fff;
            top: 20px;//根据三角的位置改变
        }//此处是一个白色的三角
        #demo:before {
            border-width: 12px;
            border-left-color: #000;
            top: 18px;
        }此处是一个黑色的三角
//当#demo:after和#demo:before的样式重合以后,由于top值的大小不同,就可以得到中间是白色,但是边框的三角形。如上图。
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<p id="demo"></p>
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To change to the style of the picture below:

The CSS code is as follows:

#demo {
            margin: 100px;;
            width: 100px;
            height: 100px;
            background-color: #fff;
            position: relative;
            border: 2px solid #333;
        }
        #demo:after, #demo:before {
            border: solid transparent;
            content: ' ';
            height: 0;
            top: 100%;
            position: absolute;
            width: 0;
        }
        #demo:after {
            border-width: 10px;
            border-top-color: #fff;
            left: 20px;
        }
        #demo:before {
            border-width: 12px;
            border-top-color: #000;
            left: 18px;
        }
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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

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The above is the detailed content of before :after how to output a small triangle. For more information, please follow other related articles on the PHP Chinese website!

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