html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  background: #111;
  overflow: hidden;
  font-family: Arial, sans-serif;
}

#game {
  display: block;
  width: 100vw;
  height: 100vh;
  background: #2e3138;
  image-rendering: pixelated;
}

#joinScreen {
  position: fixed;
  inset: 0;
  z-index: 10;
  background: #111;
  display: flex;
  align-items: center;
  justify-content: center;
}

#joinBox {
  width: 320px;
  padding: 24px;
  background: #222;
  border: 2px solid #555;
  text-align: center;
}

#joinBox h1 {
  color: white;
  margin: 0 0 16px;
}

#usernameInput {
  width: 100%;
  padding: 12px;
  font-size: 18px;
  border: 0;
  outline: none;
  margin-bottom: 12px;
  box-sizing: border-box;
}

#joinBtn {
  width: 100%;
  padding: 12px;
  font-size: 18px;
  font-weight: bold;
  border: 0;
  background: #2ecc71;
  cursor: pointer;
}

#joinError {
  color: #ff6b6b;
  min-height: 20px;
}