title: How to remove small caret from ion-select in ionic4
body: <p>I want to remove the inbuilt grey small caret from <code>ion-select</code>, and use my 
  custom caret(arrow) instead.</p>
  
  <p>Code:</p>
  
  <pre><code>ion-select {
    color: grey;
    background:url("/assets/resources/img/ArrowDownConfig.svg");
  }
  </code></pre>
  
  <p>But my css code is unable to precedence over the ionic(inbuilt).</p>
  
  <p>You can see there are two arrows in the image, one is inbuilt and another is custom. I want to remove inbuilt(ionic) one.</p>
  
  <p><a href="https://i.stack.imgur.com/jgf1P.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jgf1P.png" alt="enter image description here"></a></p>