.loading {
  position: fixed;
  width: 100%;
  height: auto;
  top:50%;
  left:0;
  padding: 30px;
  margin-top: -40px;
  background-color: rgba(150, 180, 255, .7);
  font-size: 1.5em;
  font-weight: bold;
  color: white;
  text-align: center;
}
.err {
  margin: 20px;
  color: #e73545;
  font-size: 1.5em;
}
input[type="submit"].send {
  width: 100%;
  height: 60px;
  background-color: dodgerblue;
  font-size: 18px;
  font-weight: bold;
  border: none;
  color: white;
  cursor: pointer;
}
input[type="submit"].send:disabled {
  width: 100%;
  height: 60px;
  background-color: #ccc;
  font-size: 18px;
  font-weight: bold;
  border: none;
  color: #999;
  cursor: pointer;
}
.txt-require {
  color: #e74045;
}