:root {
  --bg: #2a2a2a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
}

body {
  background: var(--bg);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.center-stage {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.portrait {
  display: block;
  max-width: min(90vw, 700px);
  max-height: 90vh;
  width: auto;
  height: auto;
}