h1 {
  padding: 0.4em 0.5em;/*文字の上下 左右の余白*/
  color: #494949;/*文字色*/
  background: #f4f4f4;/*背景色*/
  border-left: solid 5px #7db4e6;/*左線*/
  border-bottom: solid 3px #d7d7d7;/*下線*/
}

h2 {
  position: relative;
  padding: 0.5em;
  background: #a6d3c8;
  color: white;
}

h2::before {
  position: absolute;
  content: '';
  top: 100%;
  left: 0;
  border: none;
  border-bottom: solid 15px transparent;
  border-right: solid 20px rgb(149, 158, 155);
}


h3 {
  position: relative;
  display: inline-block;
  padding: 0 55px;
}

h3:before, h3:after {
  content: '';
  position: absolute;
  top: 50%;
  display: inline-block;
  width: 45px;
  height: 2px;
  border-top: solid 1px black;
  border-bottom: solid 1px black;
}

h3:before {
  left:0;
}
h3:after {
  right: 0;
}