All you need for making slides in markdown with Obsidian using the plugin advanced-slides.
This repository includes the theme night-andrea.css.
This is a modified version of the theme night.css included in advanced-slides.
Copy the css file night-andrea.css in this folder of your Obsidian vault:
~/[your-vault]/.obsidian/plugins/obsidian-advanced-slides/css
Create a folder where your slides will be and copy all the template files in there:
tpl.md
tpl_2col.md
tpl_cover.md
Copy and reuse the slide deck slides.md for your presentation.