/* General Reset and Body Styles */
body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f8f9fa;
  color: #333;
}

/* Container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Headings */
h1 {
  font-size: 2rem;
  font-weight: bold;
  text-align: center;
  margin-bottom: 20px;
  color: #007bff;
}

/* Lists */
ul {
  list-style: none;
  padding: 0;
}

li {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.3s ease;
}

li:hover {
  background-color: #f1f1f1;
}

/* Buttons */
.btn {
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: #0056b3;
}

.btn:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.text-center {
  text-align: center;
}