body {
  margin: 0;
  background: #050505;
  color: #00ff00;
  font-family: "Courier New", monospace;
}

header {
  padding: 10px 20px;
  border-bottom: 1px solid #00ff00;
}

.status {
  padding: 10px 20px;
  border-bottom: 1px solid #00ff00;
  opacity: 0.7;
}

.arena {
  display: flex;
  gap: 20px;
  padding: 20px;
}

.info {
  width: 200px;
}

canvas {
  border: 1px solid #00ff00;
  box-shadow: 0 0 10px #00ff00;
}

/* scanlines */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;

  background: repeating-linear-gradient(
    to bottom,
    rgba(0,255,0,0.05),
    rgba(0,255,0,0.05) 1px,
    transparent 1px,
    transparent 3px
  );
}