body {
    --header-height: 2.8rem;
}
@media screen and (max-width: 999px) {
    body {
        --header-height: 4rem;
    }
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: block;
    height: var(--header-height);
    --header-padding: 0.4rem;
    --header-button-size: calc(var(--header-height) - (var(--header-padding) * 2));
    background-color: rgba(0, 0, 0, 0.85);
    color: white;
    margin: 0;
    padding: var(--header-padding) 0 var(--header-padding) 1rem;
    box-sizing: border-box;
}
.header h1 {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    font-size: 100%;
    font-weight: bolder;
    height: 100%;
    width: calc(100% - var(--header-button-size));
    margin: 0;
    padding: 0;
    float: left;
}
.header .hamburger-button {
    height: var(--header-button-size);
    width: var(--header-button-size);
    float: right;
}