I tried to use https://www.codecogs.com/latex/eqneditor.php to make a font effect on LaTEX formula, however :

Basic LaTEX formula :

```
$$
\begin{align*}
Y& = \beta_{0} + \beta_{1}X_{1} + \beta_{2}X_{2} + \beta_{3}X_{1}X_{2}\\
&= \beta_{0} + \widetilde{\beta_{1}}X_{1} + \beta_{2}X_{2}; \widetilde{\beta_{1}} = \beta_{1} + \beta_{2}X_{2}\\
\end{align*}
$$
```

Highlighed LaTEX formula :

```
$$
\begin{align*}
Y& = \beta_{0} + \beta_{1}X_{1} + \beta_{2}X_{2} + \beta_{3}X_{1}X_{2}\\
&= \beta_{0} + {\color{Red} \widetilde{\beta_{1}}}X_{1} + \beta_{2}X_{2}; {\color{Red} \widetilde{\beta_{1}}} = \beta_{1} + \beta_{2}X_{2}\\
\end{align*}
$$
```

I noticed it doesn't work...

source image : https://www.awesomescreenshot.com/showImage?img_id=5503293

**Refrence**