.facebook-btn {
    display: inline-block;
    width: 200px;
    height: 45px;
    background-image: url('images/facebook-signing.svg');
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

/*.facebook-btn:hover {
        background-position: 0px -24px;
    }

    .facebook-btn:active {
        background-position: 0px -48px;
    }*/