body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}
.wrap {
  width: 100vw;
  height: 100vh;
  background: url(https://qiniu.gzhwsx.com/background.jpg) no-repeat;
  background-size: cover;
}

.top {
  height: 140px;
  padding: 20px 40px;
  color: #fff;
}

.top .logo {
  font-size: 20px;
  margin-bottom: 20px;
}

.top .tip {
  font-size: 13px;
}

.bottom {
  position: fixed;
  width: 100%;
  bottom: 20px;
  margin-bottom: 20px;
  color: #fff;
  font-size: 16px;
  color: #fff;
  display: flex;
  justify-content: center;
}
.middle {
  padding-top: 180px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 32px;
  color: #fff;
}
a:link {
  color: #fff;
  text-decoration: none;
}
a:visited {
  text-decoration: none;
  color: #fff;
}

a:hover {
  text-decoration: underline;
  color: #ccc;
}