Школьник.

server {
listen 8080;
server_name site.dev;
location / {
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $host;
proxy_http_version 1.1;
if($cookie_connect.sid)
{
proxy_pass http://site.dev:80;
}
if($http_cookie !~ "connect.sid")
{
proxy_pass http://site.dev:8080;
}
}
}

body {
  font-family: "RobotoRegular", sans-serif;
  font-size: 16px;
        background-color:#666666;
}
.registration {
    margin-top:300px;
}
.registration h3 , .registration p {
    text-align:center;
    color:#fff;
}
form {
  width: 200px;
  margin: 0 auto;
  background: #f0f0f0;
}
.registration input {
    margin:0 0 10px 0;
    display:block;
}
.registration button {
    display:block;
}

div {
overflow: hidden;
width: 250px;
height: 250px;
}
img {
height:100%;
}