.dropdown {
  display: inline-block;
  position: relative;
}

.dropdown__btn {
  font-weight: bold;
}
.dropdown__btn:focus,
.dropdown__btn:hover,
.dropdown__menu a:focus,
.dropdown__menu a:hover {
  background: #eee;
  color: #000;
}

.dropdown__menu {
  background: #fff;
  border: 1px solid #ccc;
  box-shadow: 0.1rem 0.1rem 0.2rem rgba(0, 0, 0, 0.15);
  position: absolute;
  min-width: 6rem;
  visibility: hidden;
}
.dropdown .dropdown__menu_expanded {
  visibility: visible;
}

.dropdown__menu li {
  border: 0 !important;
  margin: 0 !important;
  padding: 0 !important;
  min-height: auto !important;
}

.dropdown__menu a {
  display: block;
  border-bottom: 1px solid #ccc;
  color: #333;
  padding: 8px;
  text-decoration: none;
}
.dropdown_right .dropdown__menu a {
  text-align: right;
}
.dropdown__menu li:last-child a {
  border-bottom: 0;
}

.dropdown_nested {
  display: block;
}
.dropdown_nested .dropdown__menu {
  left: 100%;
  top: 0;
  -webkit-transform: translateX(0);
      -ms-transform: translateX(0);
          transform: translateX(0);
}

.dropdown_mega {
  display: block;
  width: 100%;
}
.dropdown_mega .dropdown__menu {
  width: 100%;
}

.dropdown_right .dropdown__menu {
  right: 0;
}

.dropdown_center .dropdown__menu {
  left: 50%;
  -webkit-transform: translateX(-50%);
      -ms-transform: translateX(-50%);
          transform: translateX(-50%);
}

@media screen and (max-width: 767px) {
  .dropdown_responsive {
    width: 100%;
    display: block;
  }
  .dropdown_responsive .dropdown__menu {
    position: static;
    -webkit-transform: none;
        -ms-transform: none;
            transform: none;
    width: 100%;
  }
}