.sub-menu {
  background-color: #f4f4f4;
  padding: 10px 0;
  border-bottom: 1px solid #ddd;
}

.sub-menu p{
  text-align: center;
  text-decoration: underline;
  color: grey;
}

.sub-menu ul {
  display: flex;
  justify-content: center;
  gap: 20px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.sub-menu a {
  display: inline-block;
  padding: 8px 16px;
  background-color: #e2e2e2;
  color: #333;
  text-decoration: none;
  border-radius: 5px;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.sub-menu a:hover,
.sub-menu a.active {
  background-color: #ffcc00;
  color: #000;
}

.back-to-top {
  text-decoration: none;
}

.back-to-top img {
  vertical-align: middle;
  width: 100px;
  height: 40px;
  margin-left: 10px;
  vertical-align: middle;
  transition: transform 0.3s ease;
}

.back-to-top img:hover {
  transform: scale(1.2);
}