body {
    width: 100%;
    height: 100%;
  }
  
  .slideout-menu {
    position: fixed;
    top: 0;
    bottom: 0;
    width: 256px;
    min-height: 100vh;
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
    z-index: 0;
    display: none;
  }
  
  .slideout-menu-left {
    left: 0;
  }
  
  .slideout-menu-right {
    right: 0;
  }
  
  .slideout-panel {
    position: relative;
    z-index: 1;
    will-change: transform;
    background-color: #FFF; /* A background-color is required */
    min-height: 100vh;
  }
  
  .slideout-open,
  .slideout-open body,
  .slideout-open .slideout-panel {
    overflow: hidden;
  }
  
  .slideout-open .slideout-menu {
    display: block;
  }


  .panel:before {
    content: '';
    display: block;
    background-color: rgba(0,0,0,0);
    transition: background-color 0.5s ease-in-out;
  }
  
  .panel-open:before {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 100%;
    background-color: rgba(0,0,0,.5);
    z-index: 99;
  }