.galerie_link {
    font-size: 2.2vmax;
    line-height: 1.5;
    font-weight: bold;
    text-align: center;
}

.galerie_link::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: #f00;
    transition: width .3s;
}

.galerie_link:hover::after {
    width: 100%;
}