.bg-img {
    background: linear-gradient(to left, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url("../img/hut_bg.jpg") no-repeat center;
    background-size: cover;
}

.link-white {
    color: white;
    transition: 100ms;
}

.link-white:hover,
footer a:focus {
    color: lightgray;
}

.popup-hidden {
    visibility: hidden;
}
.popup-show {
    visibility: visible;
}