You will find all the styles for these components insrc/assets/jss/nextjs-material-kit/components/parallaxStyle.js
.
If you want a nice parallax like that in our demo pages, you can add the following code at the beginning of your page.
import Parallax from "/components/Parallax/Parallax.js";
<Parallax filter image={require("path/to/your/image")} />
Parallax.propTypes = {
className: PropTypes.string,
filter: PropTypes.bool,
children: PropTypes.node,
style: PropTypes.string,
image: PropTypes.string,
small: PropTypes.bool,
// this will add a min-height of 660px on small screens
responsive: PropTypes.bool
};