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HTML 

              
                <label for="menu-opener" tabindex="0" aria-haspopup="true" role="button"	aria-controls="menu" class="OpenMenuButton" id="openmenu">OPEN MENU</label>


<input type="checkbox" data-menu id="menu-opener" hidden>
<aside class="DrawerMenu" role="menu" id="menu" aria-labelledby="openmenu">
  <nav class="Menu">
    <h2>Awesome CSS Menu</h2>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 01</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 02</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 03</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 04</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 05</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 06</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 07</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 08</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 09</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 10</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 11</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 12</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 13</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 14</a>
    <a role="menuitem" tabindex="-1" href="#">Menu Item 15</a>
  </nav>
  <label for="menu-opener" class="MenuOverlay"></label>
</aside>
!

CSS 

              
                @custom-selector :--opened-menu [data-menu]:checked;
@custom-media --from-small (min-width: 30em);

.OpenMenuButton {
  cursor: pointer;
  font-size: 1.5rem;
  font-weight: 900;
  word-spacing: 140%;
  letter-spacing: 4px;
}


.DrawerMenu {
  position: fixed;
  z-index: 99;
  width: 100vw;
  height: 100vh;
  top: 0;
  bottom: 0;
  transform: translateX(-100%);
  transition: transform 0.5s cubic-bezier(0.4, 0.0, 0.2, 1);
  display: grid;
  grid-template-areas: 'MENU OVERLAY';
  grid-template-columns: 15fr 5fr;
  
  @media (--from-small) {
    grid-template-columns: auto 1fr;
  }
  
  @nest :--opened-menu ~ & {
    transform: none;
  }
  
}


.Menu {
  display: block;
  flex-flow: column wrap;
  transform: translateX(-30%);
  opacity: 0;
  color: #fff;
  transition: all 500ms cubic-bezier(0.4, 0.0, 0.2, 1);
  transition-delay: 0;
  contain: content;
  grid-area: 'MENU';
  background-color: rebeccapurple;
  box-sizing: border-box;
  padding: 24px;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  
  @media (--from-small) {
    min-width: 400px;
  }
  
  
  @nest :--opened-menu ~ .DrawerMenu & {
    transform: none;
    opacity: 1;
    transition-delay: 300ms;
  }
  
  & a {
    text-decoration: none;
    color: #FFFFFF80;
    display: block;
    padding: 16px 0;
    
    &:hover {
      color: #69F0AE;
    }
  }
  
  & > * + * {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
}


.MenuOverlay {
  display: block;
  grid-area: 'OVERLAY'; 
  
  @nest [data-menu]:not(:checked) ~ .DrawerMenu & {
    pointer-events: none;
  }
}























































































































































@use postcss-preset-env {
  stage: 0;
  browsers: [
    "last 1 Chrome versions",
    "last 1 Firefox versions",
    "last 1 Safari versions",
    "last 1 Edge versions"
  ]
}
!

JS
!
999px

Console