body{
  background:#000814;
  margin:0;
  font-family:Arial;
}

.exit-btn{
  position:fixed;
  top:10px;
  right:10px;
  z-index:9999;
  background:#00264d;
  color:#fff;
  border:2px solid #4da6ff;
  padding:10px 16px;
  border-radius:8px;
  cursor:pointer;
}
.exit-btn:hover{
  background:#004c99;
}