html {
    height: 100%;
}
body {
    height: 100%;
}
.wp-site-blocks {
    height: 100%;
    display: flex;
    flex-direction: column;
}
.wp-site-blocks header {
    flex: 0;
    flex-grow: 0;
    flex-shrink: 0;
}
.wp-site-blocks .entry-content {
    flex: 1;
    flex-grow: 1;
    flex-shrink: 1;
}
.wp-site-blocks footer {
    flex: 0;
    flex-grow: 0;
    flex-shrink: 0;
}