.copy-html-btn {
  display: inline-block;
  padding: 0 1em;
  margin: 7px 0;
  cursor: pointer;
  background-color: #2c9cdb;
  color: #fff;
  border-radius: 4px;
  transition: all .5s;
}
.copy-html-btn:hover {
  background-color: #00c9fb;
}
.copy-html-btn:active {
  box-shadow: 0 0 10px 3px rgba(0, 152, 245, 0.5);
}