.solution {
  background: #EAFFE9;
  color: black;
  border: 2px solid #EAFFE9;
  border-radius: 10px;
  margin: 20px 0;
}

.exercise {
  background: #E9FBFF;
  color: black;
  /*border: 2px solid lightgray;*/
  border: 2px solid #E9FBFF;
  margin: 20px 0;
  padding: 10px 15px;
}

.exercise .exercise {
  padding: 0px;
  margin: 0px;
  border: 0px;
}

.warning {
  background: #FDE0E0;
  color: black;
  border: 2px solid #FDE0E0;
  border-radius: 0px;
  margin: 20px 0;
  padding: 10px 15px;
}