a.btn {
  color: #fff;
  background-color: #a40c00;
  font-weight: bold;
  padding: 16px 20px;
  text-decoration: none;
  position: relative;
  display: block;
  font-size: 16px;
  width: 53%;
  margin: 0 auto;
}

a.btn:hover {
  opacity: 0.6;
}

a.btn::before {
  content: '';
  width: 6px;
  height: 6px;
  border: 0px;
  border-top: solid 2px #fff;
  border-right: solid 2px #fff;
  -ms-transform: rotate(45deg);
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
  position: absolute;
  top: 50%;
  left: 2%;
  margin-top: -4px;
}
a.btn span.caution {
  display: inline-block;
  font-size: 1rem;
  text-decoration: underline;
}
a.btn_riscon span.caution {
  display: inline-block;
  font-size: 1rem;
  text-align: left;
  padding-left: 1rem;
}