#totop {
    display: block;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

#totop.visible {
    opacity: 1;
    visibility: visible;
}

@media only screen and (max-width: 767px) {
    .header .nav ul.navigation.open {
        display: block;
    }
}

@media only screen and (max-width: 767px) {
    .hamburger-wrapper {
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 10px;
    }
    .hamburger-menu {
        margin-right: 0;
    }
}