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HTML

              
                <main id="app" data-state="closed">
  <!--   Content -->
  <section class="app-content">
    <span class="bg"></span>
    <div>
      <h1>Sidebar notification layout</h1>
    <p>Responsive notification element that can be toggled to a sidebar</p>
    <figure>
    <img src="https://images.unsplash.com/photo-1592438097191-82d15d527dba?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=800&q=80" alt="A black unicorn on pink background">
      <figcaption>A little magic on the side</figcaption>
    </figure>
    </div>
  </section>

  <!--   Notification -->
  <aside id="notification" class="notification" style="--image: url(https://images.unsplash.com/photo-1582343104600-6d1fe40281fc?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=933&q=80);">
    <span class="bg"></span>
    <h2 class="notification-header">2 new messages</h2>
    <div class="notification-content">
      <ol class="notification-list">
        <li>Hi! 👋</li>
        <li>10 things all the cool kids are doing today 😎</li>
      </ol>
    </div>
  </aside>
</main>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css2?family=PT+Sans:wght@400;700&display=swap");

:root {
  --black: hsl(3, 3%, 4%);
  --white: hsl(0, 3%, 98%);
  --gray: hsl(3, 3%, 88%);
  --blue: #74c0fc;
  --yellow: #ffe066;
  --red: #ffa8a8;
  --green: #51cf66;
  --font: "PT Sans", sans-serif;
  --notification-width: 15rem;
  --gradient-bg: radial-gradient(
      circle at top left,
      var(--blue),
      var(--yellow) 60%,
      var(--red)
    )
    no-repeat center center/cover;
  --icon-mail: #{url('data:image/svg+xml;utf-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M3 7.921l8.427 5.899c0.34 0.235 0.795 0.246 1.147 0l8.426-5.899v10.079c0 0.272-0.11 0.521-0.295 0.705s-0.433 0.295-0.705 0.295h-16c-0.272 0-0.521-0.11-0.705-0.295s-0.295-0.433-0.295-0.705zM1 5.983c0 0.010 0 0.020 0 0.030v11.987c0 0.828 0.34 1.579 0.88 2.12s1.292 0.88 2.12 0.88h16c0.828 0 1.579-0.34 2.12-0.88s0.88-1.292 0.88-2.12v-11.988c0-0.010 0-0.020 0-0.030-0.005-0.821-0.343-1.565-0.88-2.102-0.541-0.54-1.292-0.88-2.12-0.88h-16c-0.828 0-1.579 0.34-2.12 0.88-0.537 0.537-0.875 1.281-0.88 2.103zM20.894 5.554l-8.894 6.225-8.894-6.225c0.048-0.096 0.112-0.183 0.188-0.259 0.185-0.185 0.434-0.295 0.706-0.295h16c0.272 0 0.521 0.11 0.705 0.295 0.076 0.076 0.14 0.164 0.188 0.259z"></path></svg>')};
  --icon-close: #{url('data:image/svg+xml;utf-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M5.293 6.707l5.293 5.293-5.293 5.293c-0.391 0.391-0.391 1.024 0 1.414s1.024 0.391 1.414 0l5.293-5.293 5.293 5.293c0.391 0.391 1.024 0.391 1.414 0s0.391-1.024 0-1.414l-5.293-5.293 5.293-5.293c0.391-0.391 0.391-1.024 0-1.414s-1.024-0.391-1.414 0l-5.293 5.293-5.293-5.293c-0.391-0.391-1.024-0.391-1.414 0s-0.391 1.024 0 1.414z"></path></svg>')};
}

* {
  transition-property: var(--property, none);
  transition-duration: var(--duration, 0s);
  transition-delay: var(--delay, 0s);
  transition-timing-function: var(--ease, linear);

  &,
  &:before,
  &:after {
    box-sizing: border-box;
  }
}

html {
  &,
  body {
    height: 100%;
  }

  body {
    margin: 0;
    background: var(--white);
    color: var(--black);
    font-family: var(--font);
  }

  figure {
    margin: 0;
    display: flex;
    align-items: flex-start;
    flex-wrap: wrap;

    figcaption {
      padding: 0.5em;
      margin: 1em;
      background: var(--gray);
      border-radius: 0.5em;
    }
  }

  img {
    max-width: 100%;
  }
}

[data-state="closed"] {
  --area: 1 / 2;
  --border: 5px;
}

[data-state="opened"] {
  --area: 1 / 2 / 3;
  --shadow: -1px 0 4px var(--gray);

  // To push content aside
  @media screen and (min-width: 60rem) {
    --area: 1 / 3 / 3;
    --shadow: none;
  }
}

#app {
  min-height: 100vh;
  background: var(--gradient-bg);
  display: grid;

  // @media screen and (min-width: 60rem) {
  //   grid-template-columns: repeat(2, 1fr) auto;
  // }
}

.app-content {
  --bg: var(--white);
  grid-area: 1 / 1 / 3 / 3;
  margin: 2rem;
  padding: 2rem;
  position: relative;

  & > * {
    z-index: 1;
    position: relative;
  }

  .bg {
    z-index: 0;
    border-radius: 5px;
    transform: none;
    transform-origin: top left;
    --property: transform;
    --duration: 0.3s;
  }

  &[data-flipping] {
    .bg {
      transition: none;
      transform: scaleX(calc(1 / var(--dw)));
    }
  }

  h1 {
    margin: 0 0 0.5em;
  }
}

.notification {
  --bg: var(--white);
  position: relative;
  grid-area: var(--area);
  border-radius: var(--border);
  box-shadow: var(--shadow);
  z-index: 2;
  --property: border-radius, margin, box-shadow;
  --duration: 0.2s, 1s, 0.5s;
  --ease: cubic-bezier(0.55, 1, 0.68, 0.53);

  .bg {
    transform: none;
    transform-origin: top right;
    border-radius: inherit;
    --property: transform;
    --duration: 0.3s;
  }

  &[data-flipping] {
    transition: none;
    transform: translate(calc(var(--dx) * -1px), calc(var(--dy) * -1px));

    .bg {
      transition: none;
      transform: scale(calc(1 / var(--dw)), calc(1 / var(--dh)));
    }
  }

  [data-state="closed"] & {
    justify-self: end;
    align-self: start;
    margin: 1rem;
    --shadow: 0px 0 3px var(--gray), 0 0 3px hsla(0, 3%, 5%, 0.6);
  }

  &-header {
    --icon-size: 1.3rem;
    margin: 0;
    padding: 0.5em;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg);
    border-radius: var(--border);

    &::before,
    &::after {
      content: "";
      width: 0;
      height: 0;
      padding: calc(var(--icon-size) / 2);
      mask: var(--icon) no-repeat center center/contain;
    }

    &::before {
      --icon: var(--icon-mail);
      background: var(--green);
      margin-right: 0.5em;
    }

    &::after {
      --icon: var(--icon-close);
      background: var(--black);
      margin-left: 0.5em;
    }

    [data-state="closed"] & {
      &::after {
        display: none;
      }
    }
  }

  &-content {
    min-width: var(--notification-width);
    opacity: 0;
    border-top: 1px solid var(--gray);
    animation: 0.3s appear 0.4s ease-in forwards;

    [data-state="closed"] & {
      display: none;
    }
  }

  &-list {
    margin: 0;
    padding: 0;
    list-style: none;

    li {
      margin: 0.5em;
      padding: 0.5rem;
      border: 1px solid var(--gray);
      border-radius: 5px;
    }
  }
}

.bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg);
  z-index: -1;
}

@keyframes appear {
  to {
    transform: none;
    opacity: 1;
  }
}

              
            
!

JS

              
                console.clear();
const appEl = document.querySelector("#app");
const notificationEl = appEl.querySelector(".notification");
const toggleEl = notificationEl.querySelector(".notification-header");

// Add click even listener to toggle state
toggleEl.addEventListener("click", () => {
  // Usi FLIP to trigger animations
  flip(() => {
    appEl.dataset.state = appEl.dataset.state === "closed" ? "opened" : "closed";
  }, notificationEl)
  // Add flip to content
  flip(() => {}, appEl.querySelector('.app-content'));
});

// F.L.I.P
const flip = (doSomething, firstEl, getLastEl = () => firstEl) => {
  // First
  const firstElRect = firstEl.getBoundingClientRect();

  requestAnimationFrame(() => {
    doSomething();

    // Last
    let lastEl = getLastEl();
    const lastElRect = lastEl.getBoundingClientRect();

    // Invert
    const dx = lastElRect.x - firstElRect.x;
    const dy = lastElRect.y - firstElRect.y;
    const dw = lastElRect.width / firstElRect.width;
    const dh = lastElRect.height / firstElRect.height;

    console.log({ dx, dy, dh, dw });

    lastEl.dataset.flipping = true;
    lastEl.style.setProperty("--dx", dx);
    lastEl.style.setProperty("--dy", dy);
    lastEl.style.setProperty("--dw", dw);
    lastEl.style.setProperty("--dh", dh);

    // Play
    requestAnimationFrame(() => {
      delete lastEl.dataset.flipping;
    });
  });
};

              
            
!
999px

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