body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

.common-container {
  max-width: 800px;
  margin: 80px auto;
  padding: 20px;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
  font-size: 2em;
  margin-bottom: 20px;
  text-align: center;
  color: #333333;
}

h2 {
  font-size: 1.5em;
  margin-top: 20px;
  margin-bottom: 10px;
  color: #444444;
  border-bottom: 2px solid #ddd;
  padding-bottom: 5px;
}

p {
  font-size: 1em;
  line-height: 1.6;
  margin-bottom: 15px;
  color: #555555;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
    text-decoration: underline;
  }

.back-to-top {
  margin-top: 30px;
  text-align: center;
}

.btn-back {
  display: inline-block;
  padding: 10px 20px;
  background-color: #444;
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
  font-size: 1em;
  transition: background-color 0.3s ease, transform 0.2s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-back:hover {
  background-color: #222;
  transform: scale(1.05);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}