Making a section with background image is easy with Cislunar.
Add .cl-section-has-bg class to the section/div, to which you want to give background. Add background image in img tag, inside this section/div. Wrap the content in div tag.
<div class="cl-section-has-bg">
<img src="path/to/some-bg.svg" />
<div>
Content...
</div>
</div>
Duis eu enim eget quam lacinia egestas ac sagittis leo. Vivamus eget nisl diam. Vivamus ullamcorper porttitor eros sagittis congue.
Lorem ipsum dolor sit amet, consec tetur adipiscing elit. Vestibulum nec diam quis mi aliquam cursus. Lorem ipsum dolor sit amet, consectetur adipiscing elit.