CSS ::Before ::After

CSS ::Before ::After How we can use before after pseudo classes in css which very good for designing
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Css ::Before ::After</title>

    <style>
        h1{
            position: relative;
            width: max-content;
        }
        h1::before
        {
             position: absolute;
            bottom: 0;
            left: 0;
            content: "";
            background-color: rgb(6, 18, 28);
            width:0%;
            height: 2px;            
              
            transition: .4s;        
        
        }

        h1:hover::before
        {
width:100%;
        }

        .hovess span {
    margin-bottom: 0 !important;
    position: relative;
    z-index: 1;
    display: inline-block;
    
        }
        .hovess
        {
            position: relative;
            width: max-content;
            padding: 10px;
             outline: none;
            border: none;
            color: #fff;
             background-color: rgb(13, 135, 95);
             
        }
.hovess:hover {
    color: #000
}
        .hovess:after
        {
           
          
           
            content: "";
              width: 0%;
            height: 100%;
            background-color: rgb(14, 249, 171);
            position: absolute;
            top: 0;
            left: 0;
            transition: all .5s ease;
            z-index: 0;
            
        }

           .hovess:hover:after
        {
           
          
           
            
            width: 100%;
          
            
        }


.manibutton
{
    padding: 5px;
    background-color: aqua;
    text-decoration: none;
    position: relative;
}

.manibutton span
{
    position: relative;
    margin-bottom: 0 !important;
    z-index: 2;

}

.manibutton::after
{
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 0%;
    height: 100%;
    background-color: rgb(12, 75, 54);
    transition: .2s ease-in-out;
}

.manibutton:hover
{
 color: #fff;
}
.manibutton:hover::after
{
    width: 100%; 
   
}
    </style>
</head>
<body>
    


    <h1> My Heading</h1>

  <a href="" class="hovess"> <span >Submit</span></a>

  <a href="" class="manibutton"><span>Click ME</span></a>
</body>
</html>