#toggle-sign, #toggle-speak {
    position: fixed;
    bottom: 20px;
    left: 20px;
    width: 40px;
    height: 40px;
    z-index: 9999;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s;
}
#toggle-speak {
    left: 70px;
}
#toggle-sign.active {
    border: 2px solid green;
    opacity: 1;
}