body {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

nav .brand-logo {
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-logo img {
    height: 64px;
}

@media (max-width: 600px) {
    .brand-logo img {
        height: 56px;
    }
}