.wp-block-gutenberg-test-hello-world {
  color: green;
  background: #cfc;
  border: 2px solid #9c9;
  padding: 20px;
}

.wp-block-awps-latest-post,
.wp-block-gutenberg-test-latest-post {
  display: block;
  border-left: 5px solid #ccc;
  padding: 10px;
}