header img {
    position: relative;
    height: 100vh;
    left: 50%;
    transform: translateX(-50%);
    opacity: .65;
    /*filter: saturate(.7);*/
}

header {
    overflow: hidden;
    background-color: #4a5a79;
    position: relative;
}

.heading {
    display: none;
    position: absolute;
    color: white;
    left: 50%;
    transform: translateX(-50%);
    top: 30vh;
    z-index: 1;
    text-align: center;
}

img ~ .heading {
    display: block;
}

.heading h1 {
    font-size: 9vw;
}

.heading h2 {
    font-size: 6vw;
    display: flex;
    flex-direction: row;
}

.heading h2:before, .heading h2:after {
    content: "";
    flex: 1 1;
    border-bottom: .2vw solid white;
    margin: auto;
}

.heading h2:before {
    margin-right: 1vw;
}

.heading h2:after {
    margin-left: 1vw;
}

#header-space {
    height: 0px; /* ca. header height */
}

img ~ #header-space {
    height: 0;
}

.scroll-down {
    display: block;
    position: absolute;
    z-index: 2;
    left: 50%;
    transform: translateX(-50%);
    bottom: 25px;
    color: #eeeeee;
    opacity: 0;
    font-size: 5rem;
    animation-name: scroll-down-animation;
    animation-duration: 1.5s;
    animation-iteration-count: 2;
}

@keyframes scroll-down-animation {
    0%      {opacity: 0}
    50%     {opacity: .4}
    100%    {opacity: 0}
}


@media (max-width: 800px) {
    .heading h1 {
        font-size: 16vw;
    }

    .heading h2 {
        font-size: 10vw;
    }
}