*{
    font-family:Verdana, Geneva, Tahoma, sans-serif;
}
#timer{
    text-align: center;
    height: 300px;
    width: 100%;
    padding-top: 10vh;
    border: 3px solid #000;
}    
#hour,#minute,#sec,#btn
{
   height: 30px; 
    font-size: 20px;
}
#clock2{
    text-align: center;
    height: 40px;
    width: 100%;
    font-size: 40px;
    background: #000;
    color: #fff;
    border: 3px solid #000;
}