.google-btn {
  display: inline-block;
  width: 150px;
  height: 35px;
  background-image: url('/Plugins/Nasca.Plugin.ExternalAuth.Google/Content/Images/new_google_logo.png') !important;
  background-repeat: no-repeat;
  background-size: contain;         /* 图片缩放到按钮内完整显示 */
  background-position: center;      /* 居中显示 */
  background-color: transparent;    /* 去掉背景色 */
  border: none;
  text-indent: -9999px;             /* 隐藏文字 */
  cursor: pointer;
}