body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: #1a1a1a;
  color: #ffffff;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

h1 {
  color: #4a9eff;
  margin-bottom: 30px;
}

h2 {
  color: #ffffff;
  margin-bottom: 15px;
}

.speed-control {
  background-color: #2a2a2a;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
}

.button-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 15px;
}

button {
  background-color: #4a9eff;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

button:hover {
  background-color: #357abd;
}

button:active {
  background-color: #2a5f9a;
}

button.selected {
  background-color: #28a745;
  box-shadow: 0 0 10px rgba(40, 167, 69, 0.5);
  font-weight: 700;
}

button.selected:hover {
  background-color: #218838;
}

p {
  color: #cccccc;
  margin: 10px 0;
}