#installBtn{
    position:fixed;
    bottom:20px;
    right:20px;
    background:#ff6600;
    color:white;
    border:none;
    padding:15px 20px;
    border-radius:50px;
    cursor:pointer;
    z-index:9999;
    font-size:16px;
    box-shadow:0 5px 15px rgba(0,0,0,.3);
}