Bootstrap - styling the toggle button on nav for mobile? : <p>I've tried googling this but am struggling to find the correct selector/class and I'm still quite new to bootstrap.</p>

<p>I'm trying to style my navigation menu on mobile. Here's an image, for reference; I'd like to change the glyphicon here (I believe it's a hamburger at the minute), and its colour. </p>

<p><a href="https://i.stack.imgur.com/8vjWC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8vjWC.png" alt="The area I want to modify"></a></p>

<p>I'd also like to increase the distance between the nav bar and the cascading bottom menu here:</p>

<p><a href="https://i.stack.imgur.com/cLmrc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cLmrc.png" alt="Right now it looks like a 1px line"></a></p>

<p>At the minute it looks like a 1px line. </p>

<p>I've tried modifying quite a few selectors in css but I'm not sure what I'm doing wrong. Any advice?</p>
