html {
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: Arial, "Helvetica Neue", Helvetica, "Microsoft YaHei", "微软雅黑", sans-serif;
  text-align: center;
}

.header {
    position: fixed;
    z-index: 100;
    background-color: rgba(51, 70, 93, 1);
    width: 100%;
    height: 52px;
    color: white;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header a {
  margin-top: 10px;
  display: block;
  color: white;
  text-decoration: none;
}

.section_0{
  color: rgba(250, 250, 250, 0.95);
  font-size: 16px;
}

.section_0 .about_content {
  width: 960px;
  margin: 0 auto;
  text-align: left;
}

.title {
  width: 100%;
  height: 60px;
  line-height: 60px;
  text-align: left;
  font-size: 26px;
  border-bottom-width: 1px;
  border-bottom-color: rgba(220, 220, 220, 0.5);
  border-bottom-style: solid;
}

.about_content .content_desc {
  width: 100%;
  padding-top: 30px;
}

.about_content .website_info {
  width: 100%;
  margin-top: 100px;
  font-size: 18px;
}

.website_info span {
  font-size: 34px;
}

#info {
  margin-top: 40px;
  border-top: 1px solid rgba(250, 250, 250, 0.5);
}

.content{
  width: 900px;
  height: 600px;
  color: white;
  margin: 100px auto 0 auto;
}

.content .title {
  text-align: center;
}

.content .desc {
  margin: 30px auto;
  color: rgba(240, 240, 240, 0.95);
}

.feedback_content {
  background-color: white;
}

.content textarea{
  width: 100%;
  height: 200px;
  border-radius: 3px;
  font-size: 16px;
  outline: none;
  border: 0;
  padding: 10px 10px;
}

.content .feedback_btn {
  margin: 30px auto;
  width: 400px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  background-color: rgba(0, 102, 204, 0.5);
  cursor: pointer;
  border-radius: 50px;
}

.feedback_btn:hover{
  background-color: rgba(0, 102, 204, 1);
}

.section_2 .title {
  font-size: 16px;
}

.section_2 .email_addr {
  height: 30px;
  line-height: 30px;
  margin: 20px auto;
}

.section_2 a{
  text-decoration: none;
  color: white;
}

#login, #logout {
  z-index: 200;
  position: fixed;
  top: 10px;
  height: 30px;
  line-height: 30px;
  font-size: 14px;
  border-radius: 0;
  right: 10px;
  width: 100px;
}

#login {
  right: 110px;
}