.btn_green {
  background: #39d934;
  background-image: -webkit-linear-gradient(top, #39d934, #226b17);
  background-image: -moz-linear-gradient(top, #39d934, #226b17);
  background-image: -ms-linear-gradient(top, #39d934, #226b17);
  background-image: -o-linear-gradient(top, #39d934, #226b17);
  background-image: linear-gradient(to bottom, #39d934, #226b17);
  -webkit-border-radius: 10;
  -moz-border-radius: 10;
  border-radius: 10px;
  text-shadow: 2px 2px 3px #666666;
  -webkit-box-shadow: 2px 2px 5px #666666;
  -moz-box-shadow: 2px 2px 5px #666666;
  box-shadow: 2px 2px 5px #666666;
  font-family: Microsoft JhengHei, Arial;
  color: #ffffff;
  font-size: 20px;
  padding: 3px 5px 7px 5px;
  border: solid #228c1f 1px;
  text-decoration: none;
}

.btn_green:hover {
  background: #226b17;
  background-image: -webkit-linear-gradient(top, #226b17, #39d934);
  background-image: -moz-linear-gradient(top, #226b17, #39d934);
  background-image: -ms-linear-gradient(top, #226b17, #39d934);
  background-image: -o-linear-gradient(top, #226b17, #39d934);
  background-image: linear-gradient(to bottom, #226b17, #39d934);
  text-decoration: none;
}