body {
  background: #000000;
  font-family: 'Perfect DOS VGA 437 Win', monospace;
  color: #000000;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.window {
  background: #009688; /* teal/green retro dialog */
  border: 4px double #000;
  width: 70%;
  padding: 10px;
  box-shadow: 5px 5px 0px #222;
}

.title {
  background: #000;
  color: #fff;
  padding: 4px;
  margin-bottom: 6px;
  font-weight: bold;
  text-align: center;
}

.content {
  background: #b2dfdb;
  padding: 10px;
  border: 2px inset #000;
  color: #000;
}

h3 {
  margin: 10px 0 5px 0;
  color: #111;
}

ul {
  padding-left: 15px;
}

.accent {
  color: #d32f2f; /* red highlight */
}

.footer {
  margin-top: 10px;
  text-align: center;
}

.btn {
  font-family: inherit;
  font-size: 14px;
  padding: 3px 10px;
  margin: 2px;
  border: 2px outset #000;
  cursor: default;
}

.btn.yellow {
  background: #ffeb3b;
  border-color: #000;
  box-shadow: 2px 2px 0px #333;
}