body {
  font-family: sans-serif;
  padding: 0;
  background-color: #f4f4f4;
  color: #333;
}
button {
  padding: 0.5em 1em;
  font-size: 1em;
  margin-bottom: 1em;
}
#question-area {
  background: #fff;
  padding: 1em;
  border-radius: 0.5em;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.explanation-cell {
  font-style: italic;
  color: #444;
  padding: 4px 8px;
  background-color: #f9f9f9;
  border-left: 2px solid #ddd;
}


.navbar, .sub-navbar {
  display: flex;
  background-color: #004080;
  padding: 10px 20px;
  gap: 20px;
  justify-content: flex-end;
}

.navbar a, .sub-navbar a {
  color: white;
  text-decoration: none;
  padding: 8px 12px;
  font-weight: bold;
}

.navbar a:hover, .sub-navbar a:hover {
  background-color: #0066cc;
  border-radius: 4px;
}

.sub-navbar {
  background-color: #0055aa;
  margin-bottom: 20px;
}

iframe {
  border: none;
  width: 100%;
  height: 100vh;
}