.f-button {
    background-image: url(../img/whatsapp-icon.png);
    background-repeat: no-repeat;
    background-position: right;
    width: 60px;
    height: 61px;
    position: fixed;
    display: block;
    right: 0;
    cursor: pointer;
    z-index: 999;
    top: 460px;
}