body{
  margin: 0;
  background: radial-gradient(#004000, #000000);
}
#logflex{
  color: #ffffff;
  font-family: sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}
form{
  border: 1px solid #003000;
  padding: 30px;
  border-radius: 12px;
  background: #001000;
  box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}
h2{
  margin-top: 0;
  font-size: 1.2rem;
  text-align: center;
}
input{
  outline: none;
  padding: 12px;
  border-radius: 6px;
  border: 1px solid #444444;
  background: #222222;
  color: #ffffff;
  margin-bottom: 15px;
  display: block;
  width: 400px;
  font-size: 1rem;
}
input[type="submit"]{
  width:100%;
  background: #006000;
  color: white;
  border: none;
  cursor: pointer;
  font-weight: bold;
}
input[type="submit"]:hover{
  background: #005000;
}