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HTML 

              
                <!-- Mobile Bar & Menu Icon -->
<input type="checkbox" class="menu-toggle" id="menu-toggle">
<div class="mobile-bar">
  <label for="menu-toggle" class="menu-icon">
	  <span></span>
	</label>
</div>

<!-- Header -->
<header class="header">
  <nav>
    <ul>
      <li><a href="#">Item 1</a></li>
      <li><a href="#">Item 2</a></li>
      <li><a href="#">Item 3</a></li>
      <li><a href="#">Item 4</a></li>
      <li><a href="#">Item 5</a></li>
    </ul>
  </nav>
</header>

<!-- Container -->
<div class="container">

  <!-- Content -->
  <section class="content">
    <h1>Menu Off-Canvas (Pure CSS)</h1>
    <p>Change the Media Query around line 200 in the CSS to change when the menu expands.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis quasi soluta sint dolor, modi consectetur repudiandae provident voluptatem illum ipsum!</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis quasi soluta sint dolor, modi consectetur repudiandae provident voluptatem illum ipsum!</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis quasi soluta sint dolor, modi consectetur repudiandae provident voluptatem illum ipsum!</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis quasi soluta sint dolor, modi consectetur repudiandae provident voluptatem illum ipsum!</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis quasi soluta sint dolor, modi consectetur repudiandae provident voluptatem illum ipsum!</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis quasi soluta sint dolor, modi consectetur repudiandae provident voluptatem illum ipsum!</p>
  </section>

  <!-- Footer -->
  <footer class="footer">
    <p>Developed by <a href="https://github.com/kaiquezimerer" target="_blank">Kaíque Zimerer</a></p>
  </footer>
</div>
!

CSS 

              
                /**---- Base ----**/

*,
*:before,
*:after {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  overflow-x: hidden;
}

body {
  background-color: #eee;
  font-family: "Open Sans", sans-serif;
  font-size: 100%;
  color: #333;
}

ol,
ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
}

h1 {
   margin: 1em 0;
}

p {
  margin: 0.9em 0;
  line-height: 1.5;
}

::selection {
  background-color: #333;
  color: #eee;
}

/**---- Mobile Bar ----**/

.menu-toggle {
  display: none;
}

.mobile-bar {
  z-index: 10;
  position: fixed;
  top: 0;
  left: 0;
  padding: 0 25px;
  width: 100%;
  height: 60px;
  background-color: #333;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
}

/**---- Menu Icon ----**/

.menu-icon {
  display: block;
  position: relative;
  width: 25px;
  height: 100%;
  cursor: pointer;
  transition: transform 300ms ease;
}

.menu-icon > span {
  display: block;
  position: absolute;
  top: 55%;
  margin-top: -0.3em;
  width: 100%;
  height: 0.3em;
  border-radius: 1px;
  background-color: #eee;
  transition: transform 300ms ease;
}

.menu-icon > span:before,
.menu-icon > span:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 1px;
  background-color: #eee;
  transition: transform 300ms ease;
}

.menu-icon > span:before {
  transform: translateY(-0.6em);
}

.menu-icon > span:after {
  transform: translateY(0.6em);
}

/**---- Menu Icon Effects ----**/

.menu-toggle:checked + .mobile-bar .menu-icon {
  transform: rotate(45deg);
}

.menu-toggle:checked + .mobile-bar span:before,
.menu-toggle:checked + .mobile-bar span:after {
  transform: rotate(90deg);
}

/**---- Off-Canvas Effect ----**/

.menu-toggle:checked ~ .header {
  transform: translateX(50%);
  transform: translate3d(50%, 0, 0);
}

.menu-toggle:checked ~ .container {
  transform: translateX(70%);
  transform: translate3d(70%, 0, 0);
}

/**---- Header ----**/

.header {
  position: fixed;
  top: 0;
  left: -35%;
  padding-top: 60px;
  width: 70%;
  height: 100%;
  background-color: #333;
  overflow-y: scroll;
  text-align: center;
  color: #eee;
  transition: transform 300ms ease;
}

.header nav,
.header ul {
  height: 100%;
}

.header li {
  border-bottom: 1px solid #eee;
}

.header a {
  display: block;
  padding: 20px;
  transition: background-color 300ms ease;
}

.header a:hover {
  background-color: #222;
}

/**---- Container ----**/

.container {
  position: relative;
  top: 60px;
  padding: 20px;
  background-color: #eee;
  transition: transform 300ms ease;
}

/**---- Content ----**/

.content {
  margin: 0 auto;
  max-width: 720px;
}

/**---- Footer ----**/

.footer {
  margin-top: 40px;
  font-size: 0.9em;
  text-align: center;
}

.footer a {
  font-weight: 700;
}

.footer a:hover {
  text-decoration: underline;
}

/**---- Viewport >= 720px ----**/

@media (min-width: 720px) {
  .menu-toggle:checked ~ .header {
    transform: translateX(0);
    transform: translate3d(0, 0, 0);
  }

  .menu-toggle:checked ~ .container {
    transform: translateX(0);
    transform: translate3d(0, 0, 0);
  }

  .mobile-bar {
    display: none;
  }

  .header {
    z-index: 5;
    position: relative;
    left: 0;
    padding-top: 0;
    width: 100%;
    height: auto;
    overflow: auto;
  }

  .header li {
    display: inline-block;
    margin-right: -6px; /* fix the inline-block gap */
    border: none;
  }

  .header a {
    padding: 12px 45px;
  }

  .container {
    top: 0;
  }
}

.content{
  display:grid;
  grid-template-columns:1fr 1fr;
  grid-gap:1em;
}
h1{
  grid-column:span 2;
}
!

JS 

              
                /**
  Menu Off-Canvas (Pure CSS)
  A simple responsive navigation menu with a off-canvas effect developed with pure CSS.
**/
!
999px

Console