stylleee.css

body,html {
    font-size: 22px;
    margin: 5;
    padding: 10;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
  }
  
.rocks {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
    border:5px;
    width:12vw;
    height:12vw;
    

}
.imgrock{
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
    width:12vw;
    height:12vw
    
    
}

.rocks:hover {
    transition: 0.5s;
    transform:scale(1.1)
    

}

.spring{
    background-color: red;
    transition: 0.5s;
    transform:scale(1.1)
   
    
}

.rocks:active{
    background-color: green;
}