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Gemini is a modern LaTex beamerposter theme šŸ–¼
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anishathalye Fix alert block background width
Newer versions of Beamer (tested with v3.55) introduced some change that
broke the rendering of alert blocks, which rendered properly with older
versions of Beamer (tested with v3.41).

Josh Holland <> found that removing the vmode
option from the beamercolorbox environment fixes the problem.

It is unclear why the vmode option was used in the first place. The
Beamer manual says that the option causes TeX to be in vertical mode
when the box starts (where normally TeX would be in horizontal mode),
and that "only TeXperts need this option, so, if you use it, you will
probably know what you are doing anyway."

In this situation, there was no particular reason why the option was
being used, so this patch removes it. Simply removing the vmode option
affects the spacing between the header's horizontal line and the start
of the text, so this patch adjusts the spacing to compensate.

The change seems to fix the behavior across versions.
Latest commit 2b156da Dec 26, 2018
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.gitignore Initial commit Jul 7, 2018
Makefile Initial commit Jul 7, 2018 Initial commit Jul 7, 2018
beamercolorthemegemini.sty Initial commit Jul 7, 2018
beamercolorthemelabsix.sty Initial commit Jul 7, 2018
poster.tex Fix errors with XeTeX Nov 15, 2018


Gemini is a modern LaTeX beamerposter theme.


  • A TeX installation that includes LuaTeX
  • LaTeX package dependencies including beamerposter (these usually come with your TeX installation, but if not, you can get them from CTAN)
  • Raleway and Lato, which are both available under Open Font License


  1. Copy the files in this repository (or clone the repository)

  2. In poster.tex, set up your paper size, column layout, and scale the content as necessary

  3. Make a copy of beamercolorthemegemini.sty, update the \usecolortheme line in poster.tex, and theme the poster to your liking (optional, but highly recommended)

  4. Run make to build your poster


Gemini currently includes three color themes:

  • gemini (default)
  • mit
  • labsix

The alternative themes are intended to be inspiration for you to make your own color theme. You're highly recommended to make your own color theme (it's really easy!) or use the default Gemini theme.

MIT theme

LabSix theme

Design goals

  • Minimal: clean and easy to read, so that the emphasis is on the content
  • Batteries included: works and looks good out of the box
  • Easy theming: easy to create and use a new color theme


Contributions to Gemini such as bug reports, new themes, and new poster components are greatly appreciated! Given the subjective nature of design, you're encouraged to open an issue or pull request early to get feedback before investing a lot of time in implementing a new feature.


Copyright (c) 2018 Anish Athalye. Released under the MIT License. See for details.

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