body {
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100vh;
    overflow-anchor: none;
}

nav {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 50;
}

header.contain {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    min-height: 8vh;
}

.nav-shrink {
    height: 9vh;       /* smaller after scroll */
    transition: height 0.3s ease-in-out;
}

.nav-initial {
    height: 40vh;      /* full screen on load */
    transition: height 0.3s ease-in-out;
}

div.page-title {
    margin: auto;
}