title: multiple classes - how do i target just one button?
body: <p>So I'm trying to change background color, etc. of a submit button </p>
  
  <pre><code> = submit_tag("Submit", class: "btn btn-sm btn-navbar")
  </code></pre>
  
  <p>I see multiple classes here, and was wondering how this works. </p>
  
  <p>I changed color of <code>btn-sm</code> but found that it doesn't do anything. I tried <code>btn-navbar</code> and it worked this time, but found that that also changes other buttons. </p>
  
  <p>If I want to change background color, etc. of just the submit button, how do i achieve that? </p>