.topnav-btn {
        display: none;
    }
    
@media screen and (max-width: 480px) {
    html {
        -webkit-text-size-adjust: none;
    }
    
    body {
       
    }
    
   .topnav-btn {
        display: block;
        float: right;
        margin: 25px;
        border: none;
        padding: 7px 20px;
        text-transform: uppercase;
        font-size: 12px;
        cursor: pointer;
    }
  
}