img { width :25%;
height :25%;
border: 1px white;
  box-shadow: 5px 5px 10px darkgrey;
  padding: 7px;
  position: relative;
  }
 
 

 
 
 
 ul { 
     list-style-type:none;
     margin:5px;
     overflow:hidden;
     align:center;
    
    
 }
 
 li {
     float: left;
      
 }
 
 
li a { 
    display:block;
    text-decoration:none;
    padding: 15px;
    border : 5px darkgrey;
}