title: Make PDF file with Laravel DomPDF
body: <p>When i use laravel DomPDF customization pdf template but i use  structure bootstrap and use css property box-shadow like this. </p>
  
  <pre><code>box-shadow: 0 4px 9px rgba(0,0,0,0.07);
  </code></pre>
  
  <p>Error display in domPDF</p>
  
  <pre><code>'box_shadow' is not a valid CSS2 property.
  </code></pre>
  
  <p>Please help me</p>