title: How can I create an element in HTML/CSS with a rectangle with a semicircle to the left side inside?
body: <p>I want to create an element in HTML/CSS like this</p>
  
  <p>I basically want to create a rectangle with a semicircle transparent inside<a href="https://i.stack.imgur.com/6UEeZ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6UEeZ.png" alt="enter image description here"></a></p>
  
  <p>i'm currently use this class but doesnt work becouse On large screens lose shape</p>
  
  <pre><code>.half-negative-circle{    
      width:100%;    
      height:100%;    
      position:relative;    
      overflow:hidden;    
      z-index: 1 !important;    
  }
  .half-negative-circle:before{    
      content:'';    
      position:absolute;    
      right:70%;   
       width:55%;    
       height:100%;    
       border-radius:100%;   
        box-shadow: 300px 200px 100px 300px #0b77dc ;
      }
  </code></pre>
  
  <p>Any help on the best way to create this type of element would be greatly appreciated.</p>
  
  <p>Thanks a lot in advance</p>