How to show a :before element outside a fixed parent-CodePudding

I can't display a :before element outside my parent element. The :before element is cut as an overflow-hidden parent's child but removing the rule didn't help me :

Here is my css code :

sidezone {
    position : fixed;
    display : block;
    width : 10%;
    height : 100%;
    right : 10%;
    top : 0px;
    bottom : 0px;
    overflow-y : scroll;
    z-index: 10;
    background : red;
}

sidezone:before {
    position : absolute;
    content : "";
    display : block;
/*  font-family: "Font Awesome 5 Free"; */
    width : 50px;
    height : 20px;
    left : -50px;
    top : 50%;
    bottom : 50%;
    background : #12b7ff;
    cursor : pointer;
    border : 3px solid #12b7ff88;
    border-radius: 5px 0px 0px 5px;
    z-index: 10;
}

sidezone:hover {
    right:0px;
}

The red color and the position of the div are just there to see where is the div and where is the :before near it.

CodePudding user response：

The problem is that the CSS set to your <slidezone> will not work correctly. This is because certain CSS features, like some of the ones set in your code, will only operate when used with certain tags. Try changing the <slidezone> tag to a <div> tag instead, give the <div> an id, and update your CSS code respectively. If the inner <div>'s id is before, your CSS code should look like this:

div#before{
    position : fixed;
    display : block;
    width : 10%;
    height : 100%;
    right : 10%;
    top : 0px;
    bottom : 0px;
    overflow-y : scroll;
    z-index: 10;
    background : red;
}

div#before:before {
    position : absolute;
    content : "";
    display : block;
/*  font-family: "Font Awesome 5 Free"; */
    width : 50px;
    height : 20px;
    left : -50px;
    top : 50%;
    bottom : 50%;
    background : #12b7ff;
    cursor : pointer;
    border : 3px solid #12b7ff88;
    border-radius: 5px 0px 0px 5px;
    z-index: 10;
}

div#before:hover {
    right:0px;
}