body {
  min-height: 100vh;
  background-color: #eee;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
a {
  text-decoration: none;
  color: #00ade6;
  margin: 10px 0;
  display: block;
}
.screen-wrap {
  height: 500px;
  width: 450px;
  margin: auto;
  margin-top: 100px;
  background-color: #fff;
  text-align: center;
}
.screen-wrap h2 {
  padding-top: 60px;
}
.screen-wrap .code-img {
  width: 180px;
  height: 180px;
  padding: 5px;
  border: 1px solid #e2e2e2;
  margin: 20px auto;
  margin-bottom: 20px;
  position: relative;
}
.screen-wrap .code-img img {
  width: 100%;
  height: 100%;
}
.timeout{

  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  color: #eee;
  cursor: pointer;

}


.screen-wrap .change-function {
  margin-top: 30px;
  display: block;
}
.not-register {
  text-align: center;
  margin: 100px auto;
  background: #f6f6f6;
  padding: 30px;
}
.not-register img {
  width: 200px;
  margin-bottom: 30px;
}