/*自分追加*/
a.read_btn {
  position: relative;
  display: inline-block;
  font-weight: bold;
  padding: 0.25em 0.5em;
  text-decoration: none;
  color: #00BCD4;
  background: #ECECEC;
  border-radius: 0 15px 15px 0;
  transition: .4s;
}
a.read_btn:hover {
  background: #636363;
}