#header{
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    display:flex;
    align-items: center;
    justify-content: center;
}
body{
    background-color: lightcyan;
}
#download{
    height: 100px;
    width: 300px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 2rem;
    border: none;
    border-radius: 50px;
    background-color: aqua;
    align-items: center;
    justify-content: center;
}
#download:hover{
    cursor:pointer ;
      box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
}