# LaTeX & MathJax basic tutorial – Highlighting equation

To highlight an equation, \bbox can be used. E.g,

produces

$$\bbox[yellow] { e^x=\lim_{n\to\infty} \left( 1+\frac{x}{n} \right)^n \qquad (1) }$$

By default, the bounding box is “tight”, so it doesn’t extend beyond the characters used in the formula.
You can add a little space around the equation by adding a measurement after the color. E.g.,

produces

$$\bbox[yellow,5px] { e^x=\lim_{n\to\infty} \left( 1+\frac{x}{n} \right)^n \qquad (1) }$$

To add a border, use

produces

$$\bbox[5px,border:2px solid red] { e^x=\lim_{n\to\infty} \left( 1+\frac{x}{n} \right)^n \qquad (2) }$$

You can do both border and background, as well:

produces

$$\bbox[yellow,5px,border:2px solid red] { e^x=\lim_{n\to\infty} \left( 1+\frac{x}{n} \right)^n \qquad (1) }$$