.menu {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 9999;
  animation: slideIn 0.3s ease-in;
}

.menu-open {
  display: block;
}

.close-btn {
  position: absolute;
  top: 0.5rem;
  right: 1rem;
  color: #fff;
  font-size: 3rem;
  cursor: pointer;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

.hidden-initially {
  opacity: 0;
  transform: translateY(100%);
}
.fullscreen-iframe {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9998;
}
#fullscreen-btn {
  z-index: 9999;
}