Estilos que se pueden usar como css y que la librería reconocerá
| Style name | Example Value |
|---|---|
| background(-color) | #000000 |
| color | #FFFFFF |
| font-weight | bold |
| font-style | italic |
| font-weight | bold |
| font-size | 20px |
| font-family | Open Sans |
| text-decoration | underline |
| text-align | center |
| vertical-align | middle |
| border(-*) | 1px dashed #CCC |
| width | 100(px) |
| height | 1100(px) |
https://docs.laravel-excel.com/2.1/reference-guide/css-styles.html