mempool/frontend/src/app/components/mempool-block-overview/mempool-block-overview.component.scss

.mempool-block-overview {
  position: relative;
  width: 100%;
  padding-bottom: 100%;
  background: #181b2d;
}

.block-overview {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  overflow: hidden;
}