src/images/features-box-dark.svg

<svg width="540" height="370" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <linearGradient x1="0%" y1="0%" y2="100%" id="a">
      <stop stop-color="#223146" offset="0%"/>
      <stop stop-color="#223146" stop-opacity="0" offset="100%"/>
    </linearGradient>
  </defs>
  <g fill="none" fill-rule="evenodd">
    <path fill="#304057" d="M0 0h540v370H0z"/>
    <path fill="url(#a)" d="M0 34.571h540v124.268H0z"/>
  </g>
</svg>