.sidenav {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 9999;
  top: 0;
  left: 0;
  background-color: #111;
  overflow-x: hidden;
  padding-top: 60px;
  transition: 0.5s;
  white-space: nowrap;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #818181;
  display: block;
  transition: 0.3s;
  text-align: left;
}

.sidenav a:hover {
  color: #f1f1f1;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

#main {
  transition: margin-left .5s;
}

@media screen and (max-height: 450px) {
  .sidenav { padding-top: 15px; }
  .sidenav a { font-size: 18px; }
}

#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: none;
  z-index: 9999;
}

.btn {
  cursor: pointer;
}

#menu-button {
  position: fixed;
  top: 10px;
  left: 10px;
  width: 40px;
  height: 40px;
  background-color: rgba(0, 0, 0, 0.7);
  color: white;
  border: none;
  border-radius: 5px;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9000;
}

#menu-button:hover {
  background-color: rgba(0, 0, 0, 0.9);
}

.dropdown {
  display: block;
}

.dropdown-btn {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: white;
  font-size: 20px;
  cursor: pointer;
  gap: 8px;
}

.arrow {
  display: inline-block;
  transition: transform 0.3s ease;
  font-size: 16px;
  font-family: "Helvetica Neue", Arial, sans-serif;
}

.dropdown-content {
  display: none;
  padding-left: 20px;
}

.dropdown-content a {
  display: block;
  padding: 8px 0 8px 40px;
  color: #818181;
  text-decoration: none;
  font-size: 20px;
}

@media screen and (max-height: 450px) {
  .dropdown-content a { font-size: 12px; }
}

.dropdown-content a:hover {
  color: white;
}

.dropdown-content.show {
  display: block;
}

.arrow.rotate {
  transform: rotate(90deg);
}