I am learning web design and js .On my webpage, I define the default color is black in jumbotron h2.

```
.jumbotron h2{
    text-align: center;
    color:black;
}

```

define reference var $jumbotron = $('.jumbotron h2');
while running, I use `$jumbotron.html('hellow world'); ......` to display some words and I want to change its color but I do not know how to set new color while running, how to get the color value and assign a new value for my variable $jumbotron? I have tried `$jumbotron.color =` or `$jumbotron.color('')` but they are wrong. I have not found any useful answers with google.