li.nav-item.dropdown a.dropdown-toggle, li.nav-item.dropdown a.dropdown-toggle span {
  display: inline-block;
  transition: all .4s;
  box-sizing: border-box;
}

li.nav-item.dropdown a.dropdown-toggle {
  position: relative;
  width: 27px;
  height: 21px;
  background: none;
  border: none;
  appearance: none;
  cursor: pointer;
}

li.nav-item.dropdown a.dropdown-toggle span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #fff;
  border-radius: 4px;
}

li.nav-item.dropdown a.dropdown-toggle span:nth-of-type(1) {
  top: 0;
}

li.nav-item.dropdown a.dropdown-toggle span:nth-of-type(2) {
  top: 10px;
}

li.nav-item.dropdown a.dropdown-toggle span:nth-of-type(3) {
  bottom: 0;
}

/* パターン１ S */
/* li.nav-item.dropdown.show a.dropdown-toggle span:nth-of-type(1) {
  transform: translateY(10px) rotate(-45deg);
}

li.nav-item.dropdown.show a.dropdown-toggle span:nth-of-type(2) {
  opacity: 0;
}

li.nav-item.dropdown.show a.dropdown-toggle span:nth-of-type(3) {
  transform: translateY(-10px) rotate(45deg);
} */
/* パターン１ E */

/* パターン３ S */
a.nav-link.dropdown-toggle.show {
  transform: rotate(360deg);
}

a.nav-link.dropdown-toggle.show span:nth-of-type(1) {
  transform: translateY(10px) rotate(-45deg);
}

a.nav-link.dropdown-toggle.show span:nth-of-type(2) {
  transform: translateY(0) rotate(45deg);
}

a.nav-link.dropdown-toggle.show span:nth-of-type(3) {
  opacity: 0;
}
/* パターン３ E */

span.dropdown-item:hover, form.dropdown-item:hover {
  color: var(--color);
  background-color: var(--background-color);
}

a.dropdown-item:hover {
  color: #fff!important;
  background-color: var(--background-color-kotami) !important;
}

a.dropdown-toggle:focus {
  outline: none;
}

a.dropdown-toggle::after {
  display: none!important;
}