html,body,button,input,select,textarea {  color: #3f484f;  font-family: "Oxygen", Arial, "Hiragino Sans GB ", "Microsoft YaHei", "微软雅黑", "STHeiti", "WenQuanYi Micro Hei", SimSun, sans-serif;  -webkit-font-smoothing: antialiased;}html,body {  margin: 0;  padding: 0;}body {  font-size: 13px;  line-height: 1.7;  background: #f6f6f6;}img {  vertical-align: middle;}h1 {  text-align: center;  margin: 40px 0 20px;  font-size: 22px;}h2 {  font-size: 14px;}ol,li {  margin: 0;  padding: 0;}li {  margin-left: 20px;}ol ol li {  margin: 0;  list-style: none;}h3 {  font-size: 13px;}.wrapper {  width: 660px;  margin: 0 auto;  padding: 40px 0;}.float {  float: right;  margin-top: 30px;  font-weight: bold;  color: #1e1e1e;}.clear {  clear: both;}@media (max-width:640px) {  .wrapper {    width: auto;    margin: 0 15px;    padding: 0;  }  .float {    margin-top: 15px;  }}