* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #0033cc;
  color: white;
  font-family: "Courier New", monospace;
}

h1 {
  margin-bottom: 20px;
  color: white;
  font-size: 2.5rem;
  text-shadow: 2px 2px 0 black;
}

button {
  margin: 6px;
  padding: 10px 20px;
  border: 2px solid white;
  background: #001166;
  color: white;
  cursor: pointer;
  font: inherit;
  font-size: 1.1rem;
}

button:hover {
  background: white;
  color: #001166;
}

#menu,
#hud,
#pause-screen {
  text-align: center;
}

#game {
  position: fixed;
  top: 0;
  left: 0;
  display: none;
  width: 100vw;
  height: 100vh;
  border: 4px solid #001166;
  background: black;
  cursor: none;
}

#hud {
  position: fixed;
  bottom: 0;
  left: 0;
  display: none;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border: 2px solid white;
  background: #001166;
}

#pause-screen {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgb(0 0 0 / 70%);
}