title: Laravel 5.7 Bootstrap 4 button color is weird
body: <p>I started new project in laravel 5.7 with bootstrap 4 but color of bootstrap buttons is weird
  Here is picture:</p>
  
  <p><a href="https://i.stack.imgur.com/HyWjH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HyWjH.png" alt="enter image description here"></a></p>
  
  <p>And this is my code:</p>
  
  <pre><code>&lt;tr&gt;
    &lt;td&gt;
      &lt;a href="#" class="btn btn-warning btn-sm"&gt;Izmeni&lt;/a&gt;
      &lt;a href="#" class="btn btn-info btn-sm"&gt;Prikaži&lt;/a&gt;
    &lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>This is in my <code>&lt;head&gt;</code>:</p>
  
  <pre><code>...
  &lt;meta charset="utf-8"&gt;
  &lt;title&gt;Unos kompanije&lt;/title&gt;
  &lt;link rel="stylesheet" href="{{asset('css/app.css')}}"&gt;
  &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"&gt;&lt;/script&gt;
  &lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"&gt;&lt;/script&gt;
  ...
  </code></pre>
  
  <p>How can I change color of my buttons so they would look same as one on bootstrap 4 website</p>
  
  <p><a href="https://i.stack.imgur.com/iqsPM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iqsPM.png" alt="enter image description here"></a></p>