Here are two cells with weird embedded styles, including colors, background colors, and sizes:

![Mathematica graphics](https://i.sstatic.net/IidTR.png)

Select both cells and press <kbd>Shift</kbd>+<kbd>Ctrl</kbd>+<kbd>N</kbd> to re-parse to StandardForm:

![Mathematica graphics](https://i.sstatic.net/wePO1.png)