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You’ll need to set the style property of the element.

With Javacript you’ll need to get a reference to the element whose styles you wish to change. This could be an ID or class.

For example, given the following HTML:

<div id="myDiv"></div>

You could write something like:

// grab the element we want to apply styles to
var el = document.getElementById('myDiv');

// change the background color style property to this rgb value = "rgb(0, 0, 0)";

You can alter any css property this way!