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HomeWeb Front-endCSS TutorialHow to implement dialog box in css

How to implement a dialog box in css: first create an HTML sample file; then position the parent element relatively; then use the CSS pseudo-class before or after to write a triangle; and finally implement the dialog box by setting the css style. .

How to implement dialog box in css

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

Pure css writing with a small triangle dialog box

In actual styles, it is often encountered to write a style similar to a dialog box, and this style often has a The small triangle is as follows:

How to implement dialog box in css

Example picture

So how to write it in css? It’s actually very simple. First make the parent element relative Position, and then use the CSS pseudo-class before or after. You can write a triangle. If you want a triangle with a border, you can overlap two. The code is as follows:

<p>
    纯css写带小三角对话框
</p>
.box2{  
    float:left;  
    position:relative;  
    width:200px;  
    height:100px;  
    border:1px solid #00f;  
    margin:50px;  
    box-sizing:border-box;  
    font-size:14px;  
    padding:10px;  
    box-shadow:0 0 2px rgba(0,0,0,.5)  
}  
.box2:before,
.box2:after{  
    position:absolute;  
    content:'';
    border:10px solid;
}  
.box2:before{  
    right: -20px;
    top:20px;
    border-color: transparent transparent transparent #00f;
}  
.box2:after{  
    border-color: transparent transparent transparent #fff;
    right: -18px;
    top: 20px;
}

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