<div class="svg-button">
  <svg viewBox="0 0 400 203" xmlns="http://www.w3.org/2000/svg">
    <path d="M350,45
             400,200 
             0,200 50,50 
             C50,45 65,0 150,5 
             L300,5
             C300,5 335,5 350,45z" fill="#fff" />
  </svg>
  <div class="significant">
    <span>&#10006;</span>
  </div>
</div>
body {
  background: #ddd;
}

.svg-button {
  position: relative;
  text-align: center;
  width: 200px;
}

.significant {
  text-align: center;
  vertical-align: middle;
  position: absolute;
  top: 50%;
  left: 50%;
  font-size: 80px;
  transform: translate(-50%, -50%);
  color: #515b64;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.