title: how to set value of color input on null
body: <p>Hi I have a color input and I want to store it in my database on null but it has default value black color
  how can I change it to null? 
  I removed value att but it has still default value</p>
  
  <pre><code>    &lt;input class="form-control h-50px" type="color" id="example-color-input" name="color_2"&gt;
  </code></pre>