#gotop {
     display: block;
     width: 50px;
     height: 50px;
     position: fixed;
     bottom: 50px;
     right: 20px;
     text-decoration: none;
     border-radius: 50%;
     background-color: rgba(255, 255, 255,0.5);
 }
 
 #gotop img {
    height:50px;
    width:50px;
     border-radius: 50%; 
 }

 @media screen and (max-width:1024px) {
     #gotop {
         width: 40px;
         height: 40px;
         position: fixed;
         bottom: 50px;
         right: 20px;
         padding-left: 1px;
     }
      
    #gotop img{
        width:40px;
        height:40px;
    }
     
 }
 
 @media screen and (max-width:415px) {
     #gotop {
         width: 30px;
         height: 30px;
         position: fixed;
         bottom: 20px;
         right: 10px;
         padding-left: 1px;
     }
    #gotop img{
        width:30px;
        height:30px;
    }  
 }