Having a box for the main topic container is pretty on-trend at the moment, but I didn’t want a fully-fledged theme with everything else.
So I’ve made a theme-component. Now you can piece together parts as you like. 
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Summary | Lightweight outline for the main topic list container |
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Preview | Discourse Theme Creator |
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Repository | GitHub - t1-tracey/discourse-lightweight-topic-container: Lightweight main outlet container for Discourse |
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Install Guide | How to install a theme or theme component |
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New to Discourse Themes? | Beginner’s guide to using Discourse Themes |
Description
This adds a box shadow and some spacing for the main container. It applies to the topic list, main container in admin dashboard, etc.
Settings
You can set a background color with the background color light and background color dark settings.
Extensibility
You can also target the background-container in another theme component.
e.g. You can add a gradient.
.background-container {
background: linear-gradient(180deg, var(--header_primary-high) 0%, rgba(137, 160, 210, 0.7) 100%);
}
Credits
Thanks to @awesomerobot and @jsthon for code in A Graceful theme for Discourse
(in that theme credits I was tmoko, haha.)
Feedback
Any constructive feedback on best practices in CSS would be much appreciated.
e.g. how to best handle dark/light, padding/margins, etc.