@tikpage/reactjs-popup/docs/src/components/Sidebar/index.css

React Popup Component - Modals,Tooltips and Menus — All in one

.sidebar {
  width: 250px !important;
  padding: 0 0.5rem 0 0;
}
.sticky-sidebar {
  position: sticky;
  top: 100px;
  width: 100%;
}
.sticky-sidebar .menu {
  background: transparent;
}
.mobile-sidebar {
  display: none;
}

@media only screen and (max-width: 768px) {
  .website-sidebar {
    display: none;
  }
  .mobile-sidebar {
    width: 100%;
    display: block;
    text-align: center;
    padding: 0px;
  }
  .menu {
    position: relative;
    top: 0px;
    font-size: 20px;
    max-height: 100vh;
  }
  .menu a:after {
    display: none;
  }
  .menu .link {
    margin: 20px 0.2em;
  }
}

/* mobile menu */

.burger-menu,
.burger-menu.open {
  display: inline-block;
  cursor: pointer;
  position: fixed;
  right: 20px;
  bottom: 40px;
  z-index: 9999;
  background: #fff;
  padding: 10px;
  border-radius: 25px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.burger-menu .bar1,
.bar2,
.bar3 {
  width: 25px;
  height: 3px;
  background-color: #333;
  margin: 4px 0;
  transition: 0.4s;
}

.burger-menu.open .bar1 {
  -webkit-transform: rotate(-45deg) translate(-4px, 4px);
  transform: rotate(-45deg) translate(-4px, 4px);
}

.burger-menu.open .bar2 {
  opacity: 0;
}

.burger-menu.open .bar3 {
  -webkit-transform: rotate(45deg) translate(-6px, -6px);
  transform: rotate(45deg) translate(-6px, -6px);
}