A text section can be customized easily without having to create CSS Codes on the platform. Changing the background of a text section to a particular color, image or video can be done inside the Site Editor.

To change the background
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Once you create or select a text section, an option on the bottom left will let you pick your desired background color, image, or video. The background image or video can be pulled directly from the Media Library, or be uploaded from your local computer.

​To change the margin and padding
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The margin and padding of the text section can also be adjusted from the left pane of the selected text section.  Ticking the box to enable "Full width" adjusts the text section to occupy the whole width of the site.  When the Margin box is ticked, you can adjust the values to create space around the whole section.  And if the Padding box is ticked, you can adjust the values to create space around the tile content.

To know more about how to adjust the padding and margins, you may refer to the existing article here.