body{
    margin: 0 auto;
    text-align: center;
    display: flex;
    justify-content: center;
    background-color: gray;
}
#main{
    max-width: 50em;
   max-height: 70em   
}
#uhr{
    background-color:rgb(193, 90, 236) ;
    width: 100%;
    height: auto;
    border-radius: 50%;
}