The Celestia Theme

2025/07/20 — v1.0.4 — Razik Ikhlef

sty File: beamerthemeCelestia.sty

Documentation in PDF format: Celestia-en.pdf

LaTeX Source: Celestia-en.tex

Contents

• Language
• Fonts
• Colors
• Layout
• Headers
• Code
• Footer
• Table of Contents
• Blocks
• Block Styles
• Emphasis Pages

Language

• language : Sets the document language (english by default), which is passed to the babel package loaded by the theme.

\usetheme[
    language=french
]{Celestia}

Fonts

• mainface: Main font for text and titles (Literata by default)
• mainfaceoptions: Options passed directly to fontspec for the main font
• sansface: Sans-serif font for structural elements (Inter by default)
• sansfaceoptions: Options passed to fontspec for the sans-serif font
• monoface: Monospace font for code (Roboto Mono by default)
• monofaceoptions: Options passed to fontspec for the monospace font
• allserif: Uses the main serif font for mathematics

\usetheme[
    mainface=EB Garamond,
    mainfaceoptions={Scale=1.1},
    sansface=Montserrat,
    monoface=Fira Code,
    allserif
]{Celestia}

Colors

• maincolor: Main color used for titles and accents (svgname LaTeX code or HTML hexadecimal)
• accentcolor: Secondary color for special elements
• backgroundcolor: Slide background color (F7F9FC by default)
• codebackgroundcolor: Code block background color (F1F3F6 by default)
• mainblue: Standard block color (045549 by default)
• maingreen: Example block color (054924 by default)
• mainred: Alert block color (490445 by default)
• unicolor: Uses the main color for all text

\usetheme[
    maincolor=045549,
    accentcolor=E63946,
    backgroundcolor=FAFAFA,
    codebackgroundcolor=F5F5F5
]{Celestia}

Layout

• margin: Content margin (2em by default)
• frametitle: Title style (elegant, plain, centered)
• decorative: Enables decorative elements
• nodecorative: Disables decorative elements
• centeredtitle: Centers the title on the title page
• titleright: Right-aligns the title

\usetheme[
    margin=1.5em,
    frametitle=centered,
    decorative,
    centeredtitle
]{Celestia}

Headers

• headstyle: Font family for titles: rmfamily (serif) or sffamily (sans-serif)
• headshape: Character style: sc (small caps), it (italic), normal
• headweight: Title weight: bfseries (bold) or mdseries (normal)

\usetheme[
    headstyle=sffamily,
    headshape=sc,
    headweight=bfseries
]{Celestia}

Code

• codebox: Enables code framing with tcolorbox (true by default)
• nocodebox: Completely disables tcolorbox code framing
• nocodeframe: Keeps tcolorbox but without visible border

\usetheme[
    nocodebox, 
    nocodeframe
]{Celestia}

Footer

• nofooter: Completely removes the footer, except for the slide number
• quartercirclefooter: Displays only the number in a quarter circle at the bottom right
• fullbarfooter: Creates a complete bar with author/title/date and number in a circle

\usetheme[
    quartercirclefooter
]{Celestia}

Table of Contents

• compacttoc: Reduces vertical spacing between table entries
• twocolumntoc: Automatically distributes sections across two balanced columns

\usetheme[
    compacttoc,
    twocolumntoc
]{Celestia}

Blocks

• block: Standard block for normal content
• exampleblock: Block for examples
• alertblock: Block for alerts

Block Styles

• soberblock: The title adopts the main block color (mainblue/maingreen/mainred) on the general document background, while the body keeps a slightly tinted background (10%)
• softblock: The title and body share the same slightly tinted background (10 %), with the title in the corresponding main color

\usetheme[
    soberblock  % Colored title on document background
]{Celestia}

% or

\usetheme[
    softblock   % Colored title on 10% background
]{Celestia}

Emphasis Pages

• Principle: The standout option transforms a slide into an emphasis page, ideal for key presentation moments: striking quotes, essential figures, messages to remember
• Visual effect:
  • Slightly tinted background (accent tint at 10 %)
  • Centered and bold text

\begin{frame}[standout]
    Key message 
    to highlight
\end{frame}