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HTML 

              
                <div class="content">
      <header>
        <h1>Popover Sliding Nav</h1>
        <button popovertarget=menu>
          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-6 h-6">
            <path stroke-linecap="round" stroke-linejoin="round" d="M3.75 6.75h16.5M3.75 12h16.5m-16.5 5.25h16.5" />
          </svg>
          <span class="sr-only">Toggle Menu</span>
        </button>
      </header>
      <main>
        <p>Jus' because the name is "Popover", it doesn't have to be a stereotypical popover.</p>
        <p>You could make a sliding menu that contains a nav. And then you can take advantage of light-dismiss, etc.</p>
        <p>You could even translate the body when you open it up.</p>
        
      </main>
    </div>
    <div popover id="menu" role="menu">
      <svg viewBox="0 0 969 955" fill="none" xmlns="http://www.w3.org/2000/svg">
        <circle cx="161.191" cy="332.736" r="133.191" fill="none" stroke="var(--text-1)" stroke-width="20" />
        <circle cx="806.809" cy="332.736" r="133.191" fill="none" stroke="var(--text-1)" stroke-width="20" />
        <circle class="eye" cx="695.019" cy="600.278" r="31.4016" fill="var(--text-1)" />
        <circle class="eye" cx="272.981" cy="600.278" r="31.4016" fill="var(--text-1)" />
        <path d="M564.388 724.628C564.388 756.538 526.035 792.455 483.372 792.455C440.709 792.455 402.356 756.538 402.356 724.628C402.356 692.717 440.709 676.897 483.372 676.897C526.035 676.897 564.388 692.717 564.388 724.628Z" fill="var(--text-1)" />
        <rect x="310.42" y="460.854" width="343.468" height="51.4986" fill="#FF1E1E" />
        <path fill-rule="evenodd" clip-rule="evenodd" d="M745.643 300.784C815.368 356.729 854.539 445.167 854.539 524.286H614.938V467.196C614.938 445.657 597.477 428.196 575.938 428.196H388.37C366.831 428.196 349.37 445.657 349.37 467.196V524.286L110.949 524.286C110.949 445.167 150.12 356.729 219.845 300.784C289.57 244.839 384.138 213.41 482.744 213.41C581.35 213.41 675.918 244.839 745.643 300.784Z" fill="var(--text-1)" />
      </svg>
      <nav>
        <a autofocus href=/home><span>Home</span></a>
        <a href=/contact><span>Contact</span></a>
        <a href=/showcase><span>Showcase</span></a>
        <a href=/blog><span>Blog</span></a>
        <a href=/about><span>About</span></a>
      </nav>
    </div>
!

CSS 

              
                @import "https://unpkg.com/open-props/open-props.min.css";
@import "https://unpkg.com/open-props/normalize.min.css";

* {
  box-sizing: border-box;
}

pre {
  background: black;
  color: hsl(10 90% 60%);
  font-weight: bold;
  width: 100%;
  max-inline-size: 100%;
  padding: 1rem;
}

:root {
  --padding: 1rem;
  --transition: 0.165s;
}

body {
  min-height: 100vh;
  width: 100vw;
  background: var(--surface-1);
}

nav {
  display: grid;
  text-transform: uppercase;
  gap: 0.5rem;
}

[popover] {
  overflow: hidden;
}

.eye {
  transform-box: fill-box;
  transform-origin: center;
  scale: 1;
  animation: blink 8s infinite linear;
}

@keyframes blink {
  0%, 46%, 48%, 50%, 100% {
    transform: scaleY(1);
  }
  47%, 49% {
    transform: scaleY(0.01);
  }
}

main {
  display: grid;
  align-items: center;
  gap: 1rem;
}

a:is(:hover, :focus-visible) span {
  translate: 1ch 0;
}
a:is(:hover, :focus-visible):after {
  scale: 1 1;
}
a span {
  display: inline-block;
  transition: translate 0.2s;
}
a:after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  translate: 0 -50%;
  height: 4px;
  width: 0.8ch;
  background: red;
  transition: scale 0.2s;
  scale: 0 1;
  transform-origin: 0 50%;
}

svg {
  width: 48px;
  z-index: 2;
}

#menu {
  background: white;
  margin: 0;
  padding: 1rem;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  position: fixed;
  inset: unset;
  top: 0;
  left: 100%;
  height: 100vh;
  width: 220px;
  border-radius: 0;
  transition: display 0.2s, overlay 0.2s, translate 0.2s;
  translate: calc(var(--open, 0) * -100%) 0;
}

[popovertarget] {
  background: transparent;
  color: var(--text-1);
}

[popovertarget] svg {
  stroke-width: 2;
  stroke: var(--text-1);
}

a {
  padding: 0.25rem;
  color: var(--text-2);
  font-size: 1.5rem;
  text-decoration: none;
  position: relative;
}

a:focus-visible {
  outline-color: var(--red-6);
}

[popovertarget] {
  position: fixed;
  top: 1rem;
  right: 1rem;
  inline-size: 48px;
  aspect-ratio: 1;
}

[popovertarget]:is(:hover, :focus-visible) {
  background: var(--surface-2);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}
.content {
  padding-top: 4rem;
  display: grid;
  place-items: center;
  align-content: start;
  transition: translate 0.2s;
}

h1 {
  margin-bottom: 2rem;
}

body:has(#menu:popover-open) .content {
  translate: -220px 0;
}

#menu::backdrop {
  background: hsl(0 0% 85% / 0.5);
  backdrop-filter: blur(4px);
  opacity: var(--open, 0);
  transition: opacity 0.2s, display 0.2s, overlay 0.2s;
}

@media (prefers-color-scheme: dark) {
  #menu {
    background: black;
  }
  #menu::backdrop {
    background: hsl(0 0% 15% / 0.5);
  }
}

#menu:popover-open,
#menu:popover-open::backdrop {
  @starting-style {
    --open: 0;
  }
  --open: 1;
}

h1 {
  font-size: 3rem;
  font-weight: 900;
}

[popover] svg {
  position: absolute;
  bottom: 20%;
  right: 0rem;
  inline-size: 300px;
  translate: 50% 25%;
}
!

JS
!
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