#installBtn {
    display: none;
    position: fixed;
    bottom: 40px;
    left: 10px;
    padding: 12px 18px;
    background: rgba(25, 49, 124, 0.4); /* semi-transparent navy */
    color: #fff;
    border: none;
    border-radius: 12px;
    z-index: 9999;
    font-size: 14px;
    backdrop-filter: blur(8px); /* glassy blur effect */
    -webkit-backdrop-filter: blur(8px); /* Safari support */
    box-shadow: 0 4px 30px rgba(0,0,0,0.2); /* subtle shadow */
    border: 1px solid rgba(255,255,255,0.2); /* faint border for glassy look */
    cursor: pointer;
}

#installBtn:hover {
    background: linear-gradient(to right, #19317C, #000000);
    cursor: pointer;
}

@media (min-width: 769px) {
    #installBtn { display: none !important; }
}