.tothetop {
    background-color: black;
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    font-size: 16px;
    line-height: 48px;
    width: 48px;
    height: 48px;

    /* place it at the bottom-right corner */
    position: fixed;
    bottom: 30px;
    right: 22px;
    z-index: 100;
    opacity: 0;
    transform: translateY(100px);
    transition: all .5s ease;
}

.showToTheTopBtn {
    opacity: 0.3;
    transform: translateY(0)
}

.tothepos {
    background-color: black;
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    font-size: 16px;
    line-height: 48px;
    width: 48px;
    height: 48px;

    /* place it at the bottom-right corner */
    position: fixed;
    bottom: 30px;
    right: 22px;
    z-index: 100;
    opacity: 0;
    transform: translateY(-100px);
    transition: all .5s ease;
}

.showToThePosBtn {
    opacity: 0.3;
    transform: translateY(0)
}

.tothetop .fa, .tothepos .fa {
    margin-top: 8px;
    margin-left: 14px;
    font-size: 30px;
}