body {
  font-family: Arial, sans-serif;
  background: #0d1117;
  color: #e6edf3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  box-sizing: border-box;
  margin: 0;
}

.hidden {
  display: none;
}

.container {
  max-width: 700px;
  background: #161b22;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

h1 {
  text-align: center;
}

button {
  background: #238636;
  border: none;
  color: white;
  padding: 10px 20px;
  border-radius: 6px;
  cursor: pointer;
  margin: 10px;
}

button:hover {
  background: #2ea043;
}

#controls {
  text-align: center;
  margin-top: 20px;
}

.option {
  background: #21262d;
  padding: 10px;
  margin: 5px 0;
  border-radius: 6px;
  cursor: pointer;
  white-space: pre-wrap;
  font-family: monospace;
  transition: 0.2s;
  line-height: 1.5rem;
}

.option:hover {
  background: #30363d;
}

.correct {
  background: #238636 !important;
}

.wrong {
  background: #da3633 !important;
}

.option[style*="border"] {
  background: #2d333b;
}

.option pre {
  white-space: pre-wrap;
  font-family: monospace;
  background: transparent;
  color: #e6edf3;
  margin: 0;
  line-height: 1.6rem;
}

.question {
  line-height: 2rem;
}

.question pre {
  font-weight: 200;
  line-height: 1.6rem;
}

code.inline {
  border: 1px solid grey;
  color: #bb690e;
  padding: 2px;
}