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About the <head>

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CSS

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CSS Base

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HTML 

              
                <a
      class="bear-link"
      href="https://twitter.com/intent/follow?screen_name=jh3yy"
      target="_blank"
      rel="noreferrer noopener"
    >
      <svg
        class="w-9"
        viewBox="0 0 969 955"
        fill="none"
        xmlns="http://www.w3.org/2000/svg"
      >
        <circle
          cx="161.191"
          cy="320.191"
          r="133.191"
          stroke="currentColor"
          stroke-width="20"
        ></circle>
        <circle
          cx="806.809"
          cy="320.191"
          r="133.191"
          stroke="currentColor"
          stroke-width="20"
        ></circle>
        <circle
          cx="695.019"
          cy="587.733"
          r="31.4016"
          fill="currentColor"
        ></circle>
        <circle
          cx="272.981"
          cy="587.733"
          r="31.4016"
          fill="currentColor"
        ></circle>
        <path
          d="M564.388 712.083C564.388 743.994 526.035 779.911 483.372 779.911C440.709 779.911 402.356 743.994 402.356 712.083C402.356 680.173 440.709 664.353 483.372 664.353C526.035 664.353 564.388 680.173 564.388 712.083Z"
          fill="currentColor"
        ></path>
        <rect
          x="310.42"
          y="448.31"
          width="343.468"
          height="51.4986"
          fill="#FF1E1E"
        ></rect>
        <path
          fill-rule="evenodd"
          clip-rule="evenodd"
          d="M745.643 288.24C815.368 344.185 854.539 432.623 854.539 511.741H614.938V454.652C614.938 433.113 597.477 415.652 575.938 415.652H388.37C366.831 415.652 349.37 433.113 349.37 454.652V511.741L110.949 511.741C110.949 432.623 150.12 344.185 219.845 288.24C289.57 232.295 384.138 200.865 482.744 200.865C581.35 200.865 675.918 232.295 745.643 288.24Z"
          fill="currentColor"
        ></path>
      </svg>
    </a>
    <article>
      <div class="assets">
        <img src="https://assets.codepen.io/605876/do-not-copy-osaka-sky.jpeg" alt="" />
        <h3>Osaka</h3>
        <img src="https://assets.codepen.io/605876/do-not-copy-osaka-tower.png" alt="" />
      </div>
      <div class="blur">
        <!-- <img src="osaka.jpeg" alt="" /> -->
        <div>
          <div class="layer" style="--index:1;"></div>
          <div class="layer" style="--index:2;"></div>
          <div class="layer" style="--index:3;"></div>
          <div class="layer" style="--index:4;"></div>
          <div class="layer" style="--index:5;"></div>
        </div>
      </div>
      <div class="content">
        <p>
          <svg
            xmlns="http://www.w3.org/2000/svg"
            viewBox="0 0 24 24"
            fill="currentColor"
            class="w-6 h-6"
          >
            <path
              d="M15.75 8.25a.75.75 0 0 1 .75.75c0 1.12-.492 2.126-1.27 2.812a.75.75 0 1 1-.992-1.124A2.243 2.243 0 0 0 15 9a.75.75 0 0 1 .75-.75Z"
            />
            <path
              fill-rule="evenodd"
              d="M12 2.25c-5.385 0-9.75 4.365-9.75 9.75s4.365 9.75 9.75 9.75 9.75-4.365 9.75-9.75S17.385 2.25 12 2.25ZM4.575 15.6a8.25 8.25 0 0 0 9.348 4.425 1.966 1.966 0 0 0-1.84-1.275.983.983 0 0 1-.97-.822l-.073-.437c-.094-.565.25-1.11.8-1.267l.99-.282c.427-.123.783-.418.982-.816l.036-.073a1.453 1.453 0 0 1 2.328-.377L16.5 15h.628a2.25 2.25 0 0 1 1.983 1.186 8.25 8.25 0 0 0-6.345-12.4c.044.262.18.503.389.676l1.068.89c.442.369.535 1.01.216 1.49l-.51.766a2.25 2.25 0 0 1-1.161.886l-.143.048a1.107 1.107 0 0 0-.57 1.664c.369.555.169 1.307-.427 1.605L9 13.125l.423 1.059a.956.956 0 0 1-1.652.928l-.679-.906a1.125 1.125 0 0 0-1.906.172L4.575 15.6Z"
              clip-rule="evenodd"
            />
          </svg>
          <span>Osaka Castle</span>
        </p>
        <p>Osaka, Japan</p>
      </div>
    </article>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&display=swap');
@import 'normalize.css';

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

:root {
	--x: 0;
	--y: 0;
}

html {
	color-scheme: light only;
}

body {
	display: flex;
	place-items: center;
	justify-content: center;
	min-height: 100svh;
	touch-action: none;
	font-family: 'SF Pro Text', 'SF Pro Icons', 'AOS Icons', 'Helvetica Neue',
		Helvetica, Arial, sans-serif, system-ui;
	margin: 0;
	padding: 0.5rem;
}

body::before {
	--line: color-mix(in lch, canvasText 25%, transparent);
	--size: 60px;
	content: '';
	height: 100vh;
	width: 100vw;
	position: fixed;
	background: linear-gradient(
				90deg,
				var(--line) 1px,
				transparent 1px var(--size)
			)
			0 -5vmin / var(--size) var(--size),
		linear-gradient(var(--line) 1px, transparent 1px var(--size)) 0 -5vmin / var(
				--size
			) var(--size);
	mask: linear-gradient(-15deg, transparent 60%, white);
	top: 0;
	z-index: -1;
}

article {
	width: 600px;
	aspect-ratio: 2 / 1.1;
	max-height: calc(100svh - 2rem);
/*	max-height: 100px;*/
	position: relative;
	overflow: hidden;
/*	border-radius: 4em;*/
/*	clip-path: inset(0 0 0 0 round 4em);*/
	max-width: calc(100% - 2rem);
}

@media(orientation: portrait) {
	article {
		min-height: 330px;
	}
}

.assets > img {
	position: absolute;
	top: 0;
	left: 50%;
	translate: -50% 0;
	height: 100%;
	width: 660px;
	object-fit: cover;
	object-position: center 43%;
	user-select: none;
	pointer-events: none;
}

.assets > img:first-of-type {
	filter: saturate(1.5) brightness(0.9);
	object-position: calc(-50% + (var(--x) * 30px)) calc(43% + (var(--y) * -20px));
}

.assets > img:last-of-type {
	object-position: calc(-50% + (var(--x) * 40px)) calc(43% + (var(--y) * -40px));
}

.assets h3 {
	position: absolute;
	left: 50%;
	top: 6%;
	margin: 0;
	font-size: 8rem;
	translate: -50% 0;
	text-transform: uppercase;
	font-family: 'Bebas Neue', sans-serif;
	color: white;
	translate: calc(-50% + (var(--x) * -30px)) calc(var(--y) * -20px);
}

.content {
	min-height: 32%;
	position: absolute;
	bottom: 0;
	width: 100%;
	color: white;
	display: grid;
	gap: 0.2rem;
	place-items: center;
	align-content: center;
	padding-bottom: 0.5rem;
	z-index: 2;
}

.content svg {
	width: 20px;
}

.content p {
	margin: 0;
	display: flex;
	align-items: center;
	gap: 0.5rem;
	font-size: 1.2rem;
	position: relative;
}

.content p:first-of-type::after {
	content: '';
	position: absolute;
	bottom: calc(100% + 1rem);
	left: 50%;
	width: 6ch;
	background: white;
	height: 1px;
	translate: -50% 0;
}

.content p:last-of-type {
	opacity: 0.8;
}

/* Blurring */
.blur {
	--layers: 5;
	position: absolute;
	inset: 0;
}

.blur .layer {
	--blur: calc(
		sin(((var(--layers) - var(--index)) / var(--layers)) * 90deg) * 30
	);
	--stop: calc(
		sin(((var(--index)) / var(--layers)) * 90deg) * 15
	);
	position: absolute;
	inset: 0;
	background: hsl(0 0% 60% / 0.05);
	backdrop-filter: blur(calc(var(--blur) * 1px));
	mask: radial-gradient(
		150% 130% at 45% 90%,
		#fff 15%,
		#0000 calc((15 + var(--stop)) * 1%)
	);
}

.assets {
	position: absolute;
	inset: 0;
	border-radius: 4em;
	overflow: hidden;
}

.bear-link {
	color: canvasText;
	position: fixed;
	top: 1rem;
	left: 1rem;
	width: 48px;
	aspect-ratio: 1;
	display: grid;
	place-items: center;
	opacity: 0.8;
}

:where(.x-link, .bear-link):is(:hover, :focus-visible) {
	opacity: 1;
}
.bear-link svg {
	width: 75%;
}
!

JS 

              
                import gsap from 'https://cdn.skypack.dev/gsap@3.12.0'

const UPDATE = ({ x, y }) => {
  gsap.set(document.documentElement, {
    '--x': gsap.utils.mapRange(0, window.innerWidth, -1, 1, x),
    '--y': gsap.utils.mapRange(0, window.innerHeight, -1, 1, y),
  })
}

window.addEventListener('mousemove', UPDATE)


// Want to handle device orientation too

const handleOrientation = ({ beta, gamma }) => {
  const isLandscape = window.matchMedia('(orientation: landscape)').matches
  gsap.set(document.documentElement, {
    '--x': gsap.utils.clamp(-1, 1, isLandscape ? gsap.utils.mapRange(-45, 45, -1, 1, beta) : gsap.utils.mapRange(-45, 45, -1, 1, gamma)),
    '--y': gsap.utils.clamp(-1, 1, isLandscape ? gsap.utils.mapRange(20, 70, 1, -1, Math.abs(gamma)) : gsap.utils.mapRange(20, 70, 1, -1, beta)),
  })
}

const START = () => {
  // if (BUTTON) BUTTON.remove();
  if (
    DeviceOrientationEvent?.requestPermission
  ) {
    Promise.all([
      DeviceOrientationEvent.requestPermission(),
    ]).then((results) => {
      if (results.every((result) => result === "granted")) {
        window.addEventListener("deviceorientation", handleOrientation);
      }
    });
  } else {
    window.addEventListener("deviceorientation", handleOrientation);
  }
};
document.body.addEventListener('click', START, { once: true })
!
999px

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