*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body, html{
    font-size: 10px;
}
header{
    height: 100vh;
    width: 100%;
    background-color: #AEE0D7;
    position: fixed;
    top: 0;
    left: 0;
    overflow-x: hidden;
    font-family: 'Oswald', sans-serif;
    z-index: 1;
}
main{
    background-color: grey;
    height: 100vh;
    margin-top: 100vh;
    z-index: 2;
    position: relative;
}
header img{
    position: absolute;
    bottom: 0;
    right: -45%;
    height: 80%;
}
nav{
    position: absolute;
    right: 9%;
    top: 4%;
    font-size: 4rem;
    z-index: 100;
}
hgroup{
    position: absolute;
    top: 15%;
    left: 10%;
    z-index: 100;
    text-transform: uppercase;
}
header h1{
    font-size: 4.5rem;
}
header h3{
    font-size: 1.4rem;
    font-weight: 700;
}
#arrow{
    width: 60px;
    height: 60px;
    border: 5px solid black;
    position: absolute;
    bottom: 10%;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 50%;
    font-size: 4rem;
    text-align: center;
    text-shadow: 0 -10px 0 black, 0 -20px 0 black;
}
#arrow:hover{
    box-shadow: 0 0 5px 5px black;
    color: white;
    background-color: black;
    border-color: white;
    text-shadow: 0 -10px 0 white, 0 -20px 0 white;
}
@media (orientation: portrait){
    h3 span::after {
    content: '\A';
        white-space: pre;
    }
}
@media (orientation: landscape){
    header img{
    position: absolute;
    bottom: 0;
    right: -0%;
    height: 80%;
    }
}
@media (max-width: 320px) {
    header h1{
        font-size: 3.8rem;
    }
    hgroup {
        transform: rotate(-15deg);
    }
}


@keyframes arrow {
    0% {transform: translateY(-80px)}
    50% {transform: translateY(0px)}
    100% {transform: translateY(80px)}
}

.fas fa-angle-down {
    animation: arrow 1.6s infinite linear;
}