h2 {
  padding: 0.4em 0.5em;
  color: #494949;
  background: #f4f4f4;
  border-left: solid 5px #7db4e6;
  border-bottom: solid 3px #d7d7d7;
}

h3 {
  background: linear-gradient(transparent 70%, #a7d6ff 70%);
}

h4 {
  position: relative;
  padding-left: 25px;
}

h4:before {
  position: absolute;
  content: '';
  bottom: -3px;
  left: 0;
  width: 0;
  height: 0;
  border: none;
  border-left: solid 15px transparent;
  border-bottom: solid 15px rgb(119, 195, 223);
}
h4:after {
  position: absolute;
  content: '';
  bottom: -3px;
  left: 10px;
  width: 100%;
  border-bottom: solid 3px rgb(119, 195, 223);
}