.login{
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background: url(../img/三亚.jpg);
  background-repeat: no-repeat;
  background-size: cover;
  filter: blur(20px);
  z-index: -1;
}
form{
  width: 400px;
  height: 300px;
  position: absolute;
  top:50%;
  left: 50%;
  z-index:1;
  margin-top: -150px;
  margin-left: -200px;
  background:#fff;
  border-radius: 10px;
}
.title{
  height: 60px;
  line-height: 60px;
  background: #189F92;
  color: #fff;
  padding-left: 20px;
  font-size: 18px;
  margin-bottom: 20px;
  border-top-right-radius: 10px;
  border-top-left-radius: 10px;
}
.username,.password,.btn{
  width: 360px;
  margin: auto;
  margin-bottom: 20px;
}
input{
  width: 360px;
  height: 46px;
  padding-left: 12px;
  outline: none;
  border-radius: 4px;
  border: 1px solid #ddd;
}
.btn input{
  background: #189F92;
  color: #fff;
  border: 0;
}