_docs/_sass/layout.scss

body {
    --header-height: 64px;
    --promotion-bar-height: 35px;
    --footer-height: 104px;
    --footer-gap: 60px;

    @media (min-width: 451px) and (max-width: 850px) {
        --header-height: 111px;        
    }

    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--body-background);
    font-family: 'Open Sans',sans-serif;

    &>section {
        flex: 1;
    }
}
header {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 2;
}
body > footer {
    margin: var(--footer-gap) 30px 0;
}
* {
    box-sizing: border-box;
}