I'm trying to change the color of my nav bar upon clicking a button. It has to be on multiple pages so i thought using CSS would be the best way. But i have no idea how to do it.

im trying to change the color of a unordered list

```
<ul id="tm-menu" class="tm-menu menu">
</ul>

```

How do i change the .menu style "background-color" with jQquery?