<h1 class="msr_h103">Heading01</h1>
<h2 class="msr_h203">Heading02</h2>
<h3 class="msr_h303">Heading03</h3>
<h4 class="msr_h403">Heading04</h4>

.msr_h103 {
  background: #1B73BA;
  box-shadow: rgba(0, 0, 0, 0.2) 0px 2px 2px 0px;
  -moz-box-shadow: rgba(0, 0, 0, 0.2) 0px 2px 2px 0px;
  -webkit-box-shadow: rgba(0, 0, 0, 0.2) 0px 2px 2px 0px;
  box-sizing: border-box;
  color: #fff;
  font-size: 30px;
  margin: 0 0 20px;
  padding: 5px 20px 5px 25px;
  position: relative;
  width: 100%;
}

/* h1白の三角形 */
.msr_h103:before {
  border-bottom: 10px solid transparent;
  border-left: 10px solid #FFF;
  border-right: 10px solid transparent;
  border-top: 10px solid transparent;
  content: " ";
  display: block;
  left: 0;
  margin: -10px 0 0 0;
  position: absolute;
  top: 50%;
}
.msr_h203 {
  background: #F8F8F8;
  border-top: 2px solid #1B73BA;
  box-shadow: rgba(0, 0, 0, 0.2) 0px 2px 2px 0px;
  -moz-box-shadow: rgba(0, 0, 0, 0.2) 0px 2px 2px 0px;
  -webkit-box-shadow: rgba(0, 0, 0, 0.2) 0px 2px 2px 0px;
  box-sizing: border-box;
  color: #1B73BA;
  font-size: 20px;
  font-weight: bold;
  margin: 0 0 20px;
  padding: 10px 15px 10px;
}
.msr_h303 {
  border-bottom: 2px solid #1B73BA;
  font-size: 18px;
  font-weight: bold;
  margin: 0 0 20px;
  padding-bottom: 5px;
}
.msr_h403 {
  border-left: 2px solid #1B73BA;
  font-size: 16px;
  font-weight: bold;
  margin: 0 0 20px;
  padding-left: 5px;
}