Org-reveal offers a number of topics (theme) to choose from, and here's how to choose theme.
There are several theme in the CSS directory:
Total used in directory available 406097684 Drwxrwxr-x 4 Dean Dean 4096 July-00:56. Drwxrwxr-x 4 Dean Dean 4096 July-00:56 . -rw-rw-r--1 Dean Dean 7028 July 00:56 beige.css -rw-rw-r--1 Dean Dean 6429 July 00:56 black.css-RW-RW -r--1 Dean Dean 6860 July 00:56 blood.css -rw-rw-r--1 Dean Dean 7084 July 00:56 league.css-rw-rw- r--1 Dean Dean 6303 July 00:56 moon.css -rw-rw-r--1 Dean Dean 6302 July 00:56 moon.css~-rw-rw-r-- 1 Dean Dean 6217 July 00:56 night.css -rw-rw-r--1 Dean Dean 1665 July 00:56 readme.md-rw-rw-r-- 1 Dean Dean 6291 July 00:56 serif.css -rw-rw-r--1 Dean Dean 6424 July 00:56 simple.css-rw-rw-r-- 1 Dean Dean 6825 July 00:56 sky.css -rw-rw-r--1 Dean Dean 6303 July 00:56 solarized.css drwxrwxr-x 2 Dean Dean 4096 July 00:56 source Drwxrwxr-x 2 Dean Dean 4096 July 00:56 template -rw-rw-r--1 Dean D Ean 6422 July 00:56 white.css
This is a global setting and requires a line of code to be added to the Init.el:
(setq org-reveal-theme "Beige")
Theme The default theme is Moon, which is now switched to beige, the following is
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Org-reveal Modifying a Theme