h3 {
  padding: .5em .75em;
  background-color: #f6f6f6;
  border-left: 6px solid #3498db;
}

h4 {
  position: relative;
  padding: .25em 0 .5em .75em;
  border-left: 6px solid #3498db;
}
h4::after {
  position: absolute;
  left: 0;
  bottom: 0;
  content: '';
  width: 100%;
  height: 0;
  border-bottom: 1px solid #ccc;
}

h5 {
  position: relative;
  padding: 5px 5px 5px 42px;
  background: #77c3df;
  font-size: 20px;
  color: white;
  margin-left: -33px;
  line-height: 1.3;
  z-index:-1;
}

h5:before {
  position: absolute;
  content: '';
  left: -2px;
  top: -2px;
  border: none;
  border-left: solid 40px white;
  border-bottom: solid 79px transparent;
  z-index:-2
}