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HTML 

              
                <div class="menu">
  <button class="menu-toggle" popovertarget="menu-items">
    <div aria-hidden="true">➕</div>
    <div class="sr-only">open menu</div>
  </button>
  <ul class="menu-items" id="menu-items" popover role="menu">
    <li class="item">
      <button role="menuitem">
        <div aria-hidden="true">♥️</div>
        <div class="sr-only">add to favorites</div>
      </button>
    </li>
    <li class="item">
      <button role="menuitem">
        <div aria-hidden="true">💾</div>
        <div class="sr-only">save to collection</div>
      </button>
    </li>
    <li class="item">
      <button role="menuitem">
        <div aria-hidden="true">🔗</div>
        <div class="sr-only">copy link</div>
      </button>
    </li>
    <li class="item">
      <button role="menuitem">
        <div aria-hidden="true">✉️</div>
        <div class="sr-only">email</div>
      </button>
    </li>
    <li class="item">
      <button role="menuitem">
        <div aria-hidden="true">🛒</div>
        <div class="sr-only">add to cart</div>
      </button>
    </li>
    <!--  Need extra close button bc the popover lays on top of the X and doesn't let you get to it    -->
    <li class="item">
      <button popovertargetaction="close" popovertarget="menu-items" class="hidden-close" role="menuitem">
        <div aria-hidden="true"> </div>
        <div class="sr-only">close menu</div>
      </button>
    </li>
  </ul>
</div>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Noto+Emoji:wght@600&display=swap');

:root {
  --btn-size: 3rem;
  --extra-space: 1.5rem;
}

/* Where the magic happens */
.item {
  --radius: calc(var(--btn-size) + var(--extra-space));
  background-color: var(--bg);
  transform: translateX(calc(cos(var(--angle)) * var(--radius)))
		         translateY(calc(sin(var(--angle) * -1) * var(--radius)))
             rotate(0deg);
  opacity: 0;
  transition: all 0.3s var(--delay) ease;
}

/* Adding for popover base */

.menu-items:not(:popover-open) .item {
  --radius: 0;
  --angle: 0;
  rotate: 45deg;
}

/* rotate the "plus" */
.menu-toggle > div {
  transition: transform 0.3s;
}

.menu:has(:popover-open) .menu-toggle > div {
  transform: rotate(45deg);
}

.hidden-close {
  transform: rotate(45deg);
  transition: opacity 0.1s;
  transition-delay: 1s;
  width: var(--btn-size);
  aspect-ratio: 1;
}

:popover-open .item {
  opacity: 1;
}

/* Every item gets a background, angle, and delay */
/* This gets updated when the popover is open */

.item:nth-child(1) {
  --bg: pink;
  --angle: 0deg;
  --delay: 0s;
}

.item:nth-child(2) {
  --bg: thistle;
  --angle: 45deg;
  --delay: 0.1s;
}

.item:nth-child(3) {
  --bg:	paleturquoise;
  --angle: 90deg;
  --delay: 0.2s;
}

.item:nth-child(4) {
  --bg: lightgreen;
  --angle: 135deg;
  --delay: 0.3s;
}

.item:nth-child(5) {
  --bg: peachpuff;
  --angle: 180deg;
  --delay: 0.4s;
}

/* Not related to demmo, just styling */

.item {
  border-radius: 50%;
  width: var(--btn-size);
  aspect-ratio: 1;
}

.menu-toggle {
  border-radius: 50%;
  width: var(--btn-size);
  aspect-ratio: 1;
  background: darksalmon;
  z-index: 1;
}

/* Grid piles */

.menu,
.menu-items,
body,
.item {
  display: grid;
  place-content: center;
}

.menu > *,
.menu-items > *,
body > *
.item button {
  grid-area: 1/1;
}

/* Resets, etc. */
/* visually-hidden ala https://www.scottohara.me/blog/2017/04/14/inclusively-hidden.html */
.sr-only {
  clip: rect(0 0 0 0); 
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap; 
  width: 1px;
}

button {
  border: none;
  background: none;
  font-family: 'Noto Emoji';
  color: #222;
  font-size: 1.25rem;
}

button:focus-visible {
  outline: 2px dashed deeppink;
  border-radius: 50%;
  aspect-ratio: 1/1;
}

body {
  height: 100vh;
}

.menu, .menu-items {
  overflow: unset;
}
!

JS
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