src/icons/class-rectangle.svg
<svg fill="#3bb300" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
xml:space="preserve" version="1.1" style="shape-rendering:geometricPrecision;text-rendering:geometricPrecision;image-rendering:optimizeQuality;"
viewBox="0 0 293 163" x="0px" y="0px" fill-rule="evenodd" clip-rule="evenodd"><defs><style type="text/css">
.outline {fill:#a6d588;fill-rule:nonzero; stroke-width: 16px; stroke:#128300;}
</style></defs><g><path class="outline" d="M285 8l0 147 -277 0 0 -147 277 0z"></path></g></svg>