body {
  background-color: #f4f6fb;
  color: #333;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  margin: 0;
  padding: 0;
}

h1 {
  color: #4a90e2;
  margin-top: 20px;
}

h2 {
  color: #666;
  font-weight: normal;
}

.ejercicio {
  background: #fff;
  border: 1px solid #ddd;
  padding: 20px;
  margin: 20px auto;
  width: 80%;
  border-radius: 12px;
  text-align: left;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  transition: transform 0.2s ease;
}

.ejercicio:hover {
  transform: scale(1.01);
}

.codigo { 
  background: #fafafa;
  border: 1px solid #ddd;
  padding: 15px;
  margin: 20px auto;
  width: 80%;
  border-radius: 12px;
  text-align: left; 
  display: grid;
  place-items: center; 
  min-height: 100px;    
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

pre {
  background: #f0f4f8;
  padding: 12px;
  border-radius: 6px;
  font-size: 14px;
  overflow-x: auto;
  border: 1px solid #ddd;
}