title: Change arrow colors in Bootstraps carousel
body: <p>I'm obviously missing something stupidly simple here. I have images with a white background so I want to be able to edit the arrows on the Bootstraps Carousel so they are visible. So many changing the color of the arrows (NOT the background like I've done). </p>
  
  <p>CSS</p>
  
  <pre><code>.carousel-control-prev-icon, .carousel-control-next-icon {
      height: 100px;
      width: 100px;
      outline: black;
      background-color: rgba(0, 0, 0, 0.3);
      background-size: 100%, 100%;
      border-radius: 50%;
      border: 1px solid black;
  }
  </code></pre>
  
  <p>Carousel HTML</p>
  
  <pre><code>&lt;div class = 'col-md-9'&gt;
  
      &lt;div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel"&gt;
  
          &lt;ol class="carousel-indicators"&gt;
              &lt;li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"&gt;&lt;/li&gt;
              &lt;li data-target="#carouselExampleIndicators" data-slide-to="1"&gt;&lt;/li&gt;
              &lt;li data-target="#carouselExampleIndicators" data-slide-to="2"&gt;&lt;/li&gt;
          &lt;/ol&gt;
  
          &lt;div class="carousel-inner" role="listbox"&gt;
              &lt;div class="carousel-item active"&gt;
                  &lt;img class="d-block img-fluid" src="carousel/Bars%20and%20Dots.jpg" alt="First slide" class = 'img-responsive'&gt;
              &lt;/div&gt;
  
              &lt;div class="carousel-item"&gt;
                  &lt;img class="d-block img-fluid" src="carousel/murial.jpg" alt="Second slide" class = 'img-responsive'&gt;
              &lt;/div&gt;
  
              &lt;div class="carousel-item"&gt;
                  &lt;img class="d-block img-fluid" src="carousel/Upper%20Partialism%20album%20covers004white.jpg" alt="Third slide" class = 'img-responsive'&gt;
              &lt;/div&gt;
          &lt;/div&gt;
  
          &lt;a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev"&gt;
              &lt;span class="carousel-control-prev-icon" aria-hidden="true"&gt;&lt;/span&gt;
              &lt;span class="sr-only"&gt;Previous&lt;/span&gt;
          &lt;/a&gt;
  
          &lt;a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next"&gt;
              &lt;span class="carousel-control-next-icon" aria-hidden="true"&gt;&lt;/span&gt;
              &lt;span class="sr-only"&gt;Next&lt;/span&gt;
          &lt;/a&gt;
  
      &lt;/div&gt;
  
  &lt;/div&gt;
  </code></pre>