title: How to build a special polygon (a kite shape) with HTML & CSS only?
body: <p>I'm working on my new project and in this I need some irregular structures. 
  One of them is:
  <a href="https://i.stack.imgur.com/dYotX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dYotX.png" alt="Kite shape"></a></p>
  
  <p>What I achieved is:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.mainkite {
    width: 200px;
    height: 200px;
    background: #f00;
    transform: skew(180deg, 180deg) rotate(45deg);
    position: relative;
    margin: 0px auto;
    margin-top: 50px;
    overflow: hidden;
  }
  .midLine {
    border: solid 1px #000;
    transform: skew(180deg, 180deg) rotate(45deg);
    position: absolute;
    top: 99px;
    width: 140%;
    left: -41px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="mainkite"&gt;
    &lt;div class="midLine"&gt;&lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p><a href="https://jsfiddle.net/80qs2a4y/" rel="nofollow noreferrer">jsfiddle</a></p>
  
  <p>How can I get the rest of the shape I desire?</p>