body {
  width: 100%;
  height: 100%;
}
#panel{
  margin: 0;
  padding: 0;
  transition: all .35s;
   box-shadow: 0 0 40px 5px rgba(0, 0, 0, 0.8);
}
#menu{
  margin-top: 80px;
}
.slideout-menu {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  z-index: 0;
  width: 256px;
  overflow-y: scroll;
  -webkit-overflow-scrolling: touch;
  display: none;
}
.slideout-panel {
  position: relative;
  z-index: 1;
 /* will-change: transform;*/
}
.slideout-open .slideout-menu {
  display: block;
}

@media(min-width: 0px){
  body{padding-top: 80px;}
  #panel{
    /*overflow-x: hidden;*/
  }
  .slideout-open,
  .slideout-open body,
  .slideout-open .slideout-panel {
    overflow: hidden;
  }
}
@media(min-width: 768px){
  body{padding-top: 0;}
  #panel{
    transform: none !important;
    /*overflow-x: visible;*/
  }
  #menu{display: none;}
  .slideout-open,
  .slideout-open body,
  .slideout-open .slideout-panel {
    overflow: visible;
  }
  .slideout-open .slideout-menu {
    display: none;
  }
}