@property --w_raw {
  syntax: "<length>";
  inherits: true;
  initial-value: 100vw;
}

@property --h_raw {
  syntax: "<length>";
  inherits: true;
  initial-value: 100vh;
}

:root {
  --w: tan(atan2(var(--w_raw), 1px));
  --h: tan(atan2(var(--h_raw), 1px));
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: Arial, sans-serif;
  font-size: 24px;
  background-color: #f4f4f4;
}

body::before {
  content: counter(w) " x " counter(h);
  counter-reset: h var(--h) w var(--w);
  background-color: #ff4081;
  color: white;
  padding: 20px;
  border-radius: 8px;
}