<ul class="navbar" id="navbar">
    <li><a href="#">Home</a></li>
    <li><a href="#">Profile</a></li>
    <li><a href="#">About</a></li>
    <li><a href="#">Contacts</a></li>
    <a class="close" href="#">
      <img src="https://ljc-dev.github.io/testing0/ham-close.svg" alt="close">
    </a>
  </ul>
  <a class="hamburger" href="#navbar">
      <img src="https://ljc-dev.github.io/testing0/ham.svg" alt="menu">
  </a>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  /* border: 1px solid red; */
}

body {
  /* background is white by default but added for clarity */
  background: white;
  width: 100%;
}

.hamburger, .close {
  border: none;
  cursor: pointer;
  /* position absolute position the icons relative to the body because they have no position relative parents*/
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
}

.hamburger {
  background: white;
}

.close {
  background: black;
}

.hamburger img, .close img {
  width: 100%;
  height: 100%;
}

.navbar {
  position: absolute;
  /* a higher z-index put navbar above hamburger */
  z-index: 1000;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  /* basic menu styling*/
  list-style: none;
  background: black;
  display: flex;
  flex-flow: column nowrap;
  justify-content: space-evenly;
  align-items: center;
  /* animate slide up/down */
  transform: translateY(-100%);
  transition: transform 0.2s ease;
}

/* :target is called when its anchor id #navbar is called by clicking on the hamburger which has href="#navbar" */

.navbar:target {
  /* show navbar */
  transform: translateY(0);
}

li a {
  display: block;
  font-family: 'Open Sans', sans-serif;
  color: white;
  font-weight: bold;
  font-size: 1.2rem;
  /* remove default underline and add our own with padding and border bottom */
  text-decoration: none;
  border-bottom: 1px solid black;
  padding-bottom: 0.5rem;
}

li a:hover, li a:focus {
  /* show border bottom */
  border-bottom: 1px solid white;
}