.accordion_menu {
  height: auto;
  width: 90%;
  margin: 10px auto;
  padding: 5px;
  background: #fff;
}

label {
  background: #184988;
  color: #fff;
  padding: 10px;
  display: block;
  margin: 0;
  border: 1px solid #fff;
  cursor: pointer;
}

input[type="checkbox"].on-off{
  display: none;
}

.menu ul {
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.menu li {
  padding: 5px;
}

input[type="checkbox"].on-off + ul{
  display: none;
}

input[type="checkbox"].on-off:checked + ul{
  display: block;
}