body {
  padding: 30px;
  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
}

a {
  color: #00B7FF;
}

.spritztab #sptab {
  width: 70vmin;
  height: 50vmin;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0;
  margin: 30px auto;
}

.spritztab h1 {
  text-align: center;
  margin-top: 50px;
}

.spritztab h2 {
  text-align: center;
}

.spritztab button {
  width: 10vmin;
  height: 10vmin;
  background: white;
  border: 1px solid black;
  margin: 0;
  font-size: 200%;
}

.spritztab [aria-label="o"] {
  background-image: url('data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201%201%22%3E%3Ccircle%20cx%3D%220.5%22%20cy%3D%220.5%22%20r%3D%220.4%22%20fill%3D%22none%22%20stroke-width%3D%220.1%22%20stroke%3D%22blue%22%2F%3E%3C%2Fsvg%3E');
}

.spritztab [aria-label="x"] {
  background-image: url('data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201%201%22%3E%3Cline%20x1%3D%220.1%22%20y1%3D%220.1%22%20x2%3D%220.9%22%20y2%3D%220.9%22%20stroke-width%3D%220.1%22%20stroke%3D%22red%22%2F%3E%3Cline%20x1%3D%220.1%22%20y1%3D%220.9%22%20x2%3D%220.9%22%20y2%3D%220.1%22%20stroke-width%3D%220.1%22%20stroke%3D%22red%22%2F%3E%3C%2Fsvg%3E');
}