#cover {
    background: #000;
    opacity: 0.6;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    display: none;
  }
  #menu {
    z-index: 2;
    position: absolute;
    top: 0;
    right: -180px;
    color: #fff;
    background: #4c81e9;
    padding: 8px;
    box-sizing: border-box;
    width: 180px;
    min-height: 100%;
    transition: .4s;
    font-size: 20px;
  }
  #menu ul {
    list-style: none;
  }
  #menu li {
    padding-bottom: 15px;
    cursor: pointer;
    user-select: none;
  }
  #menu li a {
    text-decoration: none;
    color: white;
  }
  #menu li a:hover {
    opacity: 0.5;
    transition: .8s;
  }
  .baseL {
    text-decoration: none;
    border-bottom: 1px solid white;
    padding-bottom: 1px;
  }
  #show, #hide {
    float: right;
    cursor: pointer;
  }
  body.menu-open {
    overflow-y: hidden;
  }
  body.menu-open #cover {
    display: block;
  }
  body.menu-open #menu {
    right: 0;
  }