/* styles for the mobile menu */
#mobile-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: #000;
  padding: 1rem;
  text-align: center;
}

#mobile-menu li {
  margin-bottom: 1rem;
}

#mobile-menu button {
  width: 100%;
}

/* hide the mobile menu by default */
#mobile-menu {
  display: none;
}

/* show the mobile menu when the mobile menu button is clicked */
#mobile-menu-btn:focus+#mobile-menu {
  display: block;
}

/* hide the mobile menu button on larger screens */
@media (min-width: 640px) {
  #mobile-menu-btn {
    display: none;
  }
}