.box84 {
  position: relative;
  border-top: solid 2px #80c8d1;
  border-bottom: solid 2px #80c8d1;
  background: #f4f4f4;
  line-height: 1.4;
  padding: 0.4em 0.5em;
  margin: 2em 0 0.5em;
}

.box84:after {
  /*タブ*/
  position: absolute;
  font-family: "Font Awesome 5 Free",'Quicksand','Avenir','Arial',sans-serif;
  font-weight: 900;
  content: '\f0a7\ POINT';
  background: #80c8d1;
  color: #fff;
  left: 0px;
  bottom: 100%;
  border-radius: 5px 5px 0 0;
  padding: 5px 7px 3px;
  font-size: 0.7em;
  line-height: 1;
  letter-spacing: 0.05em;
}