.content {
    display: grid;
    grid-template-rows: min-content 1fr;
}
#frmRegister {
    display: grid;
    grid-template-rows: repeat(auto-fit, minmax(min-content, var(--height-3)));
    grid-template-columns: 1fr;
    justify-items: stretch;
    row-gap: 1em;
    padding: 2em 3em;
}

.div-controls {
    margin-top: 1em;
}

.login-link {
    margin-top: 1em;
    display: block;
    text-align: center;
}
.login-link a {
    font-size: inherit;
    color: var(--link-color);
}