.mail-button {
  background-color: #fff;
  border: 2px solid #e3e3e3;
  color: #666;
  padding: 10px 15px;
  font-size: 16px;
  font-weight: bold;
  border-radius: 5px;
  text-align: center;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease-in-out;
}

.mail-button:before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: #e3e3e3;
  transform-origin: right center;
  transform: rotate(45deg);
  transition: all 0.2s ease-in-out;
}

.mail-button:hover {
  background-color: #e3e3e3;
  color: #333;
  border-color: #b5b5b5;
}

.mail-button:hover:before {
  transform: rotate(0deg);
  background-color: #b5b5b5;
}