devheroes.css

1-yellow

blockquote {
  border-right: 5px solid rgba(233, 223, 46, 0.44);
  background-color: #fcf8e3;
}

2- red

blockquote {
  border-right: 5px solid rgba(206, 142, 146, 0.75);
  background-color: #f2dede;
}

3-blue

blockquote {
  border-right: 5px solid #abd7f7;
  background-color: #d9edf7;
}

4-green

blockquote {
  border-right: 5px solid #b1d07e;
  background-color: #dff0d8;
}