.stack-menu {
   background-color: #fff;
position: absolute;
   overflow: hidden;
   margin-top: 12px;
   height: 100vh; 
   width: 100%;
  transition: 1s;
  top: -100vh;
  left: 0;
  display: block;
  padding-bottom: 77px;

   
    
  transform: translateY(-100%) !important; 
 }
 .stack-menu.open{
  transform: translateY(0%) !important; 
  top: 51px;
  overflow: auto;



 }
 .stack-menu--active {
   display: block;
 }
 .stack-menu__list {
    margin: 0;
   padding: 0;
   list-style-type: none; 
    display: none; 
 } 
  .stack-menu__list--active {
   display: block; 
 } 
 .stack-menu__item--hidden {
   display: none;
 }
 .stack-menu__link {
   display: block;   
   position: relative;
   /* -webkit-transition: color 0.25s ease-in-out, background-color 0.25s ease-in-out, background-image 0.25s ease-in-out;
   -moz-transition: color 0.25s ease-in-out, background-color 0.25s ease-in-out, background-image 0.25s ease-in-out;
   transition: color 0.25s ease-in-out, background-color 0.25s ease-in-out, background-image 0.25s ease-in-out; */
 } 
  /* .stack-menu__link--parent,
 .stack-menu__link--back {
 
   -webkit-background-size: 6px 12px;
           background-size: 6px 12px;
   background-repeat: no-repeat;
 }  */
 /* .collapse{
 display: block;

 }
 .collapse.show{

 display: block;
 } */
 .stack-menu__link--back {
  padding-left: 36px !important;
  background: #fff url(../image/vector_menu_left.svg) 4% 53% no-repeat !important;
 }
 .stack-menu__link--hidden {
   display: none;
 }

 /* .stack-menu__link--parent:hover {
   background-image: url("data:image/svg+xml,%3Csvg width='6' height='12' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23fff' fill-rule='evenodd'%3E%3Cpath d='M.087 1.656L1.232.318l4.681 5.026-1.145 1.338z'/%3E%3Cpath d='M4.768 5.318l1.145 1.338-4.68 5.026-1.146-1.338z'/%3E%3C/g%3E%3C/svg%3E");
 }
 .stack-menu__link--back:hover {
   background-image: url("data:image/svg+xml,%3Csvg width='6' height='12' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23fff' fill-rule='evenodd'%3E%3Cpath d='M5.913 1.656L4.768.318.087 5.344l1.145 1.338z'/%3E%3Cpath d='M1.232 5.318L.087 6.656l4.68 5.026 1.146-1.338z'/%3E%3C/g%3E%3C/svg%3E");
 } */