Mini Shell

<svg xmlns="http://www.w3.org/2000/svg" height="512" width="512" viewBox="0 0 512 512">
  <defs>
    <clipPath id="a">
      <path fill-opacity=".67" d="M166.02 0h850v850h-850z"/>
    </clipPath>
  </defs>
  <g clip-path="url(#a)" transform="translate(-100) scale(.6024)">
    <path fill="#0053a5" d="M0 0h1300v850H0z"/>
    <g fill="#ffce00">
      <path d="M400 0h250v850H400z"/>
      <path d="M0 300h1300v250H0z"/>
    </g>
    <g fill="#d21034">
      <path d="M475 0h100v850H475z"/>
      <path d="M0 375h1300v100H0z"/>
    </g>
  </g>
</svg>