html
{
    background-color: black;

    animation: 7s infinite alternate ease-out breathing-color--dark;
}

@keyframes breathing-color--dark {
    from
    {
        background-color: black;
    }
    to
    {
        background-color: #110000;
    }
}

@media screen and (max-height: 500px){
    .logo {
        height: 12em !important;
    }
}
@media screen and (min-height: 501px) {
    .logo {
        height: 20em;
    }
}

@media screen and (max-width: 840px) {
    .header {
        font-size: 2em;
        font-weight: 600;
        margin-top: 0;
    }
}
@media screen and (min-width: 841px) {
    .header {
        font-size: 5em;
    }
}