How to Make a Color Box in LaTeX

In many documents, especially math documents, it is useful to place a definition, formula, or note inside a colored frame. This helps the reader focus on important content and makes the page easier to scan.

Here is one example.

Creating Color Boxes in LaTeX

The most common package for this purpose is tcolorbox. Add it to the preamble:

\usepackage{tcolorbox}

With tcolorbox, you can control the frame color, background color, title placement, and many other details. The official documentation is available on CTAN: https://www.ctan.org/pkg/tcolorbox.

Here are a few simple examples.

Example 1: Title and Body in Separate Boxes

In this example, the title appears like a small label attached to the main content box.

\begin{tcolorbox}[
  colback=white,
  colframe=blue!70!black,
  title=Definition
]
A linear equation in one variable is an equation with exactly one variable
whose highest power is one.
\end{tcolorbox}

The output looks like this.

Example 2: Title in a Small Box at the Top

You can also emphasize the title by placing it in a small box above the main body.

\begin{tcolorbox}[
  enhanced,
  colback=yellow!10,
  colframe=red!70!black,
  coltitle=white,
  boxed title style={colback=red!70!black},
  title=Definition
]
Let $a$, $b$, and $c$ be real numbers with $a \ne 0$.
A quadratic equation has the general form
\[
ax^2 + bx + c = 0.
\]
\end{tcolorbox}

The output looks like this.

What if you want a more decorative box like the following?

Example 3: Using the bclogo Package

For that style, you can use the bclogo package.

\usepackage{bclogo}

Then create the box like this:

\begin{bclogo}[couleur=blue!15, arrondi=0.1, logo=\bcinfo]{Note}
If two parallel lines are cut by another line, then corresponding angles
have the same measure.
\end{bclogo}

Those examples show the basic idea of building color boxes in LaTeX. You can extend them further with different colors, icons, border styles, and title layouts.

Closing

That is a short guide to creating color boxes in LaTeX. This feature is especially useful when writing worksheets, lecture notes, or math handouts that need clear visual emphasis.