html,
body {
    min-height: 100%;
}

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

.nk-site-header,
.footer {
    flex: 0 0 auto;
}

.nk-site-content {
    min-width: 0;
    flex: 1 0 auto;
}

.footer {
    margin-top: auto;
}