How to implement arrows in front-end css

How to implement arrows in front-end css: set the arrow box and set the attributes in the div. The code is [

].

The operating environment of this tutorial: windows7 system, css3 version, DELL G3 computer.

Front-end css method to implement arrows:

Rendering:

htm part:

<div class="arrow_box">
    <div class="arrow"></div>
</div>

css part:

.arrow_box{
    width:100px;
    height:100px;
    border-radius: 10px;
    background: rgba(255,0,0,0.5);
    position: relative;
}     
 
.arrow{
    width:0;
    height:0;
    border-width: 10px;
    border-style:solid;
    border-color:transparent transparent transparent rgba(255,0,0,0.5);
    position: absolute;
    right:-20px;
    top:35px;
}

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