body {
  font-family: Arial, sans-serif;
  margin: 2rem;
  background: #f4f4f4;
  color: #333;
}

header {
  background: #4a79d9;
  color: white;
  padding: 1rem;
  text-align: center;
}

h2 {
  text-align: center;
  margin-top: 2rem;
}

#instructions {
  margin: 1.5rem 0;
  text-align: center;
}

#startquiz {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  background-color: #4a79d9;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

#startquiz:disabled {
  background-color: #aaa;
  cursor: not-allowed;
}

#quizclock {
  font-weight: bold;
  font-size: 1.25rem;
  margin-left: 1rem;
}

table {
  width: 100%;
  margin-top: 1rem;
  border-collapse: collapse;
}

td {
  padding: 0.5rem;
  font-size: 1.1rem;
}

input[type="text"], input[type="number"] {
  width: 60px;
  padding: 0.25rem;
  font-size: 1rem;
}

#container {
  position: relative;
}

#overlay {
  position: absolute;
  top: 0;
  left: 0;
  background-color: #000;
  opacity: 0.8;
  width: 100%;
  height: 100%;
  z-index: 10;
  transition: all 0.3s ease-in-out;
}

.showquiz {
  display: block;
}

.hidequiz {
  display: none;
}