Creating a Solstice and Equinox Animation Using HTML and CSS

				
					@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300..700&display=swap');

*,
*::before,
*::after {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

:root {
  --text: .7rem;
  --text-xs: .6rem;
  --space: 1rem;
  --black: #000;
  --white: #fff;
  --grey-light: #d7d7d7;
  --blue: #0050ff;
  --green: #3dc200;
  --yellow: #ffff00;
}

@media only screen and (min-width: 500px) {
  :root {
    --text: .8rem;
    --text-xs: .7rem;
  }
}

@media only screen and (min-width: 1025px) and (min-height: 500px) {
  :root {
    --text: 1rem;
    --text-xs: .85rem;
    --space: 1.6rem;
  }
}

html {
  width: 100%;
  height: 100%;
  font-family: "Space Grotesk", sans-serif;
  font-size: 16px;
  font-optical-sizing: auto;
  font-style: normal;
  scrollbar-gutter: auto;
  scrollbar-width: thin;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  position: relative;
  background: var(--black);
  background-image: radial-gradient(ellipse at center, #1c2330 0%, var(--black) 100%);
  color: var(--white);
}

p {
  font-weight: 600;
  font-size: var(--text);
  text-transform: uppercase;
  white-space: nowrap;
  margin: 0;
}

h2,
h3,
h4,
h5,
h6 {
  font-weight: 400;
  font-size: var(--text);
  text-transform: uppercase;
  line-height: 1.3;
  margin: 0;
}

p {
  font-size: var(--text);
  line-height: 1.3;
  margin: 0;
}

small {
  font-size: var(--text-xs);
}

header,
footer {
  position: fixed;
  padding: .4rem 1rem;
  background: linear-gradient(90deg, #6a6a6a, var(--grey-light));
  border-radius: 0 0 20px 20px;
  box-shadow: 0px 0px 1px var(--white) inset, 0px 0px 1px #000 inset;
  pointer-events: none;
  z-index: 999;
}

header {
  top: 0;
  left: 51%; /* optical fix */
  transform: translateX(-50%);
}

footer {
  bottom: 0;
  left: 51%;
  transform: translateX(-50%);
  border-radius: 20px 20px 0 0;
}

header h1,
footer p {
  color: rgba(255, 255, 255, 0.4);
  text-shadow: 1px 0px 1px rgba(0, 0, 0, 0.6), -.5px 0px .5px rgba(255, 255, 255, 0.2), -.25px 0px .25px rgba(255, 255, 255, 0.5);
  font-size: var(--text);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: .1rem;
  line-height: 1;
  white-space: nowrap;
  pointer-events: auto;
}

footer p {
  font-size: var(--text-xs);
}

.i-more {
  display: inline-block;
  position: relative;
  margin: 0 .3rem 0 -.3rem;
  font-size: smaller;
  letter-spacing: 0;
  line-height: 1;
  top: -.15rem;
  cursor: pointer;
}

.i-more span {
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-32%) translateY(100%);
  visibility: hidden;
  opacity: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  transition: opacity 1s;
  text-align: center;
  font-weight: lighter;
}

.i-more:hover span,
.i-more:focus span {
  transform: translateX(-32%) translateY(-100%);
  visibility: visible;
  opacity: .8;
  clip: unset;
}

main {
  display: grid;
  place-content: center;
  height: 100%;
  width: 100%;
  overscroll-behavior: contain;
  overflow-y: hidden;
  position: relative;
  z-index: 1;
}

.sections {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(1, 1fr);
  width: 100%;
  overflow: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  overscroll-behavior: contain;
  position: relative;
}

.section {
  padding: calc(var(--space)*2);
  height: 100vh;
  width: 65vw;
  scroll-snap-align: center;
  position: relative;
  background-image:
    radial-gradient(var(--white), rgba(255, 255, 255, .2) 1px, transparent 3px),
    radial-gradient(var(--white), rgba(255, 255, 255, .2) .5px, transparent 3px),
    radial-gradient(var(--white), rgba(255, 255, 255, .2) 1px, transparent 3px),
    radial-gradient(var(--white), rgba(255, 255, 255, .2) .5px, transparent 3px),
    radial-gradient(var(--white), rgba(255, 255, 255, .2) 1px, transparent 3px),
    radial-gradient(var(--white), rgba(255, 255, 255, .2) 1px, transparent 3px);
  background-size: 550px 550px, 350px 350px, 250px 250px, 150px 140px, 350px 350px, 200px 70px;
  background-position: 0 0, 40px 70px, 200px 280px, 80px 120px, 100px 20px, 80px 120px;
}

.sections p {
  display: inline-block;
  font-size: var(--text-xs);
  text-transform: uppercase;
  line-height: 1;
  color: rgba(255, 255, 255, 0.4);
  text-shadow: -.5px 0px .5px rgba(255, 255, 255, 0.2);
}

@media only screen and (min-width: 1025px) and (min-height: 500px) {
  .sections p {
    font-size: var(--text);
  }
}

.orbit {
  position: absolute;
  width: calc(195vw - 70%);
  height: 10vw;
  top: calc(100vh - 50% - 4vw);
  left: 35%;
  pointer-events: none;
}

.orbit:before,
.orbit:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  border-bottom: 1px dotted var(--grey-light);
  border-radius: 0 0 50% 50%;
  z-index: 2;
}

.orbit:before {
  border-bottom: 0;
  border-top: 1px dotted var(--grey-light);
  border-radius: 50% 50% 0 0;
  z-index: -1;
}

.o-info {
  position: absolute;
  z-index: 3;
}

.o-info.top {
  top: calc(-1.4*var(--text));
}

.o-info.left {
  left: 20%;
  transform: rotate(-2.5deg);
}

.o-info.right {
  left: unset;
  right: 20%;
  transform: rotate(2.8deg);
}

.o-info.left.bottom {
  transform: rotate(2.8deg);
}

.o-info.right.bottom {
  transform: rotate(-2.8deg);
}

.o-info.bottom {
  top: unset;
  bottom: calc(-1.4*var(--text));
}

.o-info p {
  text-transform: none;
  pointer-events: auto;
}

.o-info.bottom ruby {
  ruby-position: under;
}

/* safari :/ */
@supports (-webkit-hyphens: none) {
  ruby {
    display: inline-flex;
  }
}

.sun {
  width: 16vw;
  height: 16vw;
  position: absolute;
  top: calc(50% - 8vw);
  left: calc(50% - 8vw);
  border-radius: 50%;
  background: var(--yellow);
  box-shadow: 0px 0px 100px var(--yellow), 0px 0px 100px var(--yellow);
  text-align: center;
  pointer-events: none;
  z-index: 2;
}

.sun:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  border-radius: 50%;
  background: radial-gradient(transparent 0%, rgba(255, 197, 0, 0.5) 30%, transparent 100%) 0px 0px, radial-gradient(rgb(255, 208, 0) 0%, transparent 50%) 0 0, radial-gradient(transparent 0%, rgba(160, 0, 0, 0.3) 30%, transparent 100%) 0px 0px;
  background-size: 80% 50%, 60% 60%, 80% 80%;
  box-shadow: 0px 0px 50px rgba(255, 255, 255, 0.5);
  animation-name: textureRotate;
  animation-duration: 30s;
  mix-blend-mode: darken;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

.sunwarn {
  position: relative;
  top: 25%;
  font-weight: bolder;
  color: red;
  line-height: 1;
  display: none;
  z-index: 99999;
}

@media only screen and (width: 500px) and (max-height: 200px),
only screen and (min-aspect-ratio: 4/1) {
  .sunwarn {
    display: block;
  }
}

.planet {
  width: 14vw;
  height: 14vw;
  top: calc(50% - 7vw);
  left: calc(50% - 7vw);
  border-radius: 50%;
  background-color: var(--blue);
  position: absolute;
  z-index: 2;
}

[data-section="2"] .planet {
  top: calc(50% - 12vw);
  z-index: 0;
}

[data-section="2"] .planet:last-of-type {
  top: calc(50% - 2vw);
  z-index: 4;
}

.tag {
  position: absolute;
  top: calc(-1*var(--space));
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  white-space: nowrap;
  z-index: 99;
}

[data-section="2"] .planet:last-of-type .tag {
  top: unset;
  bottom: calc(-1*var(--space));
}

@media only screen and (min-width: 900px) and (max-height: 500px) {
  [data-section="2"] .planet .tag {
    top: calc(-1*var(--space) - .25rem);
  }

  [data-section="2"] .planet:last-of-type .tag {
    top: unset;
    bottom: calc(-1*var(--space) - .25rem);
  }
}

@media only screen and (min-width: 900px) and (max-height: 420px) {
  [data-section="2"] .planet .tag {
    top: calc(10% + 1vw);
    width: fit-content;
    padding: 0 .5rem .1rem;
    justify-self: center;
    background: rgba(8, 8, 8, 0.5);
    border-radius: 10px;
  }

  [data-section="2"] .planet:last-of-type .tag {
    top: unset;
    bottom: calc(10% + 1vw);
  }
}

.planet::after {
  content: '';
  width: 100%;
  height: 100%;
  border-radius: 50%;
  position: absolute;
  right: 0;
  top: 0;
  background-image:
    radial-gradient(rgba(255, 255, 255, .5),
      rgba(255, 255, 255, .5) 10px, transparent 50px);
  background-size: 50% 40%;
  background-position: 10% 20%;
  mix-blend-mode: overlay;
}

.atmosphere {
  width: 14vw;
  height: 14vw;
  border-radius: 50%;
  position: absolute;
  mix-blend-mode: overlay;
  opacity: .6;
  z-index: 2;
  background:
    radial-gradient(transparent 0%, rgba(255, 255, 255, .5) 30%, transparent 100%) 0px 0px,
    radial-gradient(rgba(255, 255, 255, 1) 0%, transparent 50%) 0 0,
    radial-gradient(transparent 0%, rgba(255, 255, 255, .5) 30%, transparent 100%) 0px 0px;
  background-color: rgba(0, 0, 0, 0.3);
  background-size: 80% 50%, 60% 60%, 80% 80%;
  box-shadow: 0px 0px 50px rgba(255, 255, 255, 0.5);
  animation-name: textureRotate;
  animation-duration: 30s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}

@media (prefers-reduced-motion: no-preference) {
  @keyframes textureRotate {
    from {
      transform: rotate(0deg);
    }

    to {
      transform: rotate(360deg);
    }
  }
}

.earth {
  width: 14vw;
  height: 14vw;
  clip-path: circle(50%);
  overflow: hidden;
  transform: rotate(23.45deg);
  /* Earth's axis is tilted! */
}

/* approximations :) */
.eurasia {
  width: 80%;
  height: 70%;
  background: var(--green);
  clip-path: polygon(0% 55%, 5% 45%, 10% 45%, 10% 45%, 10% 38%, 0% 40%, 10% 22%, 29% 22%, 36% 0%, 56% 22%, 68% 22%, 81% 20%, 93% 19%, 99% 26%, 96% 43%, 73% 80%, 65% 68%, 60% 70%, 53% 80%, 40% 80%, 36% 75%, 30% 56%, 46% 58%, 37% 61%, 30% 72%, 25% 60%, 20% 60%, 15% 62%, 16% 58%, 17% 58%, 10% 55%, 10% 55%, 2% 65%);
  position: absolute;
  transform: rotate(353deg);
  top: -9%;
  left: 50%;
  z-index: 1;
}

.america {
  width: 100%;
  height: 150%;
  background: var(--green);
  clip-path: polygon(15% 27%, 2% 10%, 17% 5%, 10% 0%, 42% 0%, 42% 0%, 44% 10%, 35% 8%, 40% 16%, 25% 28%, 28% 30%, 30% 35%, 56% 37%, 56% 40%, 70% 40%, 70% 48%, 68% 50%, 65% 65%, 68% 75%, 58% 62%, 52% 52%, 45% 52%, 42% 48%, 40% 42%, 44% 38%, 45% 34%, 31% 36%, 27% 36%);
  transform: rotate(10deg);
  position: absolute;
  top: 8%;
  left: -26%;
  z-index: 1;
}

.africa {
  width: 68%;
  height: 68%;
  background-color: var(--green);
  clip-path: polygon(5% 38%, 5% 20%, 10% 20%, 25% 17%,
      30% 15%, 40% 25%, 45% 28%, 70% 30%, 65% 48%,
      55% 60%, 40% 95%, 30% 89%, 26% 74%, 26% 50%,
      16% 50%);
  position: absolute;
  top: 30%;
  left: 50%;
  z-index: 1;
}

.oceania {
  width: 48%;
  height: 38%;
  background: var(--green);
  clip-path: polygon(15% 40%,
      29% 10%, 44% 19%, 57% 31%, 65% 49%,
      60% 81%, 49% 88%, 35% 100%, 26% 80%,
      15% 75%, 15% 50%);
  position: absolute;
  bottom: 5%;
  right: -40%;
  z-index: 1;
}

div[data-section="1"] .planet::before,
div[data-section="2"] .planet:last-of-type::before,
div[data-section="3"] .planet::before {
  content: '';
  border-radius: 49%; /* optical fix */
  width: 14vw;
  height: 14vw;
  position: absolute;
  left: 0;
  top: 0;
  background: linear-gradient(90deg, rgba(0, 0, 0, .9), rgba(0, 0, 0, .8) 48%, rgba(0, 0, 0, 0));
  z-index: 2;
}

div[data-section="2"] .planet:last-of-type::before {
  background: radial-gradient(circle at 50% 100%, rgba(0, 0, 0, .8) 60%, rgba(0, 0, 0, 0.5));
}

div[data-section="3"] .planet::before {
  background: linear-gradient(-90deg, rgba(0, 0, 0, .9), rgba(0, 0, 0, .8) 48%, rgba(0, 0, 0, 0));
}

.rocket {
  height: 5vw;
  width: 24vw;
  padding-left: 13vw;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  bottom: 4rem;
  overflow: hidden;
  transform: translateY(0) translateX(calc(41vw - 100%)) rotate(0deg) scale(1);
  z-index: 99;
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {

  /* use Chrome to test :) */
  @supports (animation-timeline: scroll()) {
    .rocket {
      animation: rocketScroll linear both;
      animation-timeline: scroll(x);
      animation-range: contain;
      animation-duration: 1ms;
    }
  }

  @keyframes rocketScroll {
    0% {
      transform: translateY(0) translateX(calc(41vw - 100%)) rotate(0deg) scale(1);
    }

    25% {
      transform: translateY(-50vh) translateX(calc(68vw - 100%)) rotate(-30deg) scale(.5);
    }

    50% {
      transform: translateY(-60vh) translateX(calc(110vw - 100%)) rotate(0deg) scale(0);
    }

    75% {
      transform: translateY(-50vh) translateX(calc(140vw - 100%)) rotate(30deg) scale(-.5);
    }

    100% {
      transform: translateY(0) translateX(calc(179vw - 100%)) rotate(0) scale(-1);
    }
  }

}

.r-body {
  clip-path: polygon(75% 0%, 90% 50%, 75% 100%, 0% 100%, 0% 0%);
  background: radial-gradient(var(--white) 0%, transparent 50%) 0 0, radial-gradient(rgb(90, 90, 90) 0%, transparent 70%) 62px 0;
  background-color: var(--white);
  background-size: 71px 4px;
  box-shadow: -3vw 0 5px rgb(105, 105, 105) inset, -3vw 0 5px rgb(105, 105, 105) inset;
  height: 2vw;
  width: 11vw;
  color: var(--black);
  position: absolute;
  z-index: 6;
}

.r-body::after {
  content: '';
  clip-path: polygon(75% 0%, 90% 50%, 75% 100%, 0% 100%, 0%, 0%);
  background-image: linear-gradient(0deg, rgba(255, 255, 255, 0) 0%, var(--white) 50%, transparent 100%);
  width: 100%;
  height: 100%;
  position: absolute;
  z-index: 6;
  mix-blend-mode: overlay;
}

.r-body span {
  position: absolute;
  top: 50%;
  left: 15%;
  width: .5vw;
  height: .5vw;
  border: .5vw ridge;
  border-color: #404040 transparent transparent var(--black);
  transform: translateY(-50%) rotate(135deg);
  opacity: .2;
  overflow: hidden;
  text-indent: -9999px;
  z-index: 7;
}

.r-wings {
  background: radial-gradient(var(--white) 0%, transparent 50%) 0 0, radial-gradient(rgb(90, 90, 90) 0%, transparent 70%) 0 79px;
  background-color: var(--white);
  background-size: 9px 62px;
  clip-path: polygon(30% 0%, 70% 0%, 100% 100%, 0% 100%);
  transform: translateX(-1vw) rotate(90deg);
  box-shadow: 0 0 10px var(--black) inset;
  height: 5vw;
  width: 5vw;
  position: absolute;
  z-index: 5;
}

.r-porthole {
  background-color: rgb(200, 200, 200);
  box-shadow: 0 0 1px rgb(0, 0, 0);
  border-radius: 50%;
  height: 1.2vw;
  width: 1.2vw;
  margin-left: 3vw;
  position: absolute;
  z-index: 7;
}

.r-porthole::before {
  content: '';
  position: absolute;
  background: radial-gradient(circle at 20% 50%, var(--white) 0%, transparent 40%);
  border-radius: 50%;
  width: 100%;
  height: 100%;
  z-index: 7;
}

.r-flames {
  position: absolute;
  width: 16vw;
  height: 2vw;
  left: 2vw;
  border-radius: 50%;
  background-image: radial-gradient(at right, rgb(135, 0, 255) 0%, rgb(0, 110, 255) 10%, rgb(114 220 248) 28%, rgba(220, 245, 245, 1) 40%, rgba(220, 245, 245, 1) 44%, rgba(220, 245, 245, .5) 46%, rgb(255, 255, 255, 0) 60%);
  mix-blend-mode: overlay;
  animation: flameScale 2s infinite;
}

@media (prefers-reduced-motion: no-preference) {
  @keyframes flameScale {
    50% {
      transform: scaleX(1.5);
    }

    100% {
      transform: scaleX(0.5);
    }
  }
}