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HTML

              
                <div class="content">
  <div class="system">
    <div class="star"></div>
    <div class="planet"></div>
    <div class="planet"></div>
    <div class="planet"></div>
    <div class="planet double-moon"></div>
    <div class="planet ring"></div>
    <div class="planet moon"></div>
    <div class="asteroid">
      <div class="belt"></div>
    </div>
  </div>
  <button id="random-planets" onclick="randomPlanets()">Randomize</button>
</div>
              
            
!

CSS

              
                /* ... IN PROGRESS ... */
/* Improving surfaces */
/* Add more planets */

body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: 
    repeating-conic-gradient(#0003 0.00001%, #fff0 .00005%, #fff0 .00035%, #fff0 .00005%),
    repeating-conic-gradient(#fff2 0.00002%, #fff0 .00008%, #fff0 .0009%, #fff0 .008%),
    radial-gradient(circle at 50% 50%, hsla(var(--s2), 50%, 50%, 0.25) -25%, #0000 50%),
    radial-gradient(circle at 50% 50%, #222, #000);
  --star-color: hsl(calc(var(--s2) * 1deg) 100% 50%);
  --star-crater: hsl(calc(var(--s2) * 0.95deg) 90% 50%);
}

body:before {
  content: "";
  position: absolute;
  width: 200%;
  height: 200%;
  background: repeating-conic-gradient(#fff4 0.00002%, #fff0 .00008%, #fff0 .0009%, #fff0 .008%);
  animation: orbit 300s linear 0s infinite;
  opacity: 0.5;
  filter: drop-shadow(0 0 0 5px #fff8);
}

.content {
  width: 100vmin;
  height: 100vmin;
  border-radius: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.system {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.star {
  width: var(--s1);
  height: var(--s1);
  background: 
    radial-gradient(circle at 25% 50%, var(--star-crater) 0 10%, #fff0 20% 100%), 
    radial-gradient(circle at 65% 30%, var(--star-crater) 0 7%, #fff0 17% 100%),
    radial-gradient(circle at 85% 75%, var(--star-crater) 0 3%, #fff0 10% 100%), 
    var(--star-color);
  box-shadow: 0 0 calc(var(--s1) / 2) calc(var(--s1) / 10) var(--star-color), 0 0 calc(var(--s1) / 75) calc(var(--s1) / 10) var(--star-color), 0 0 calc(var(--s1) * 1.5) 0 var(--star-color);
  border-radius: 100%;
  animation: orbit 10s linear 0s infinite;
}

.star:before, .star:after {
  content: "";
  position: absolute;
  width: 130%;
  height: 130%;
  left: -15%;
  top: -15%;
  border-radius: 100%;
  border: calc(var(--s1) / 10) dotted hsl(calc(var(--s2) * 1deg) 100% 50%);
  box-sizing: border-box;
  filter: blur(7px);
}

.star:after {
  filter: blur(18px);
  animation: orbit 5s linear 0s infinite;
}

@keyframes orbit {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}







.planet {
  position: absolute;
  width: var(--p1);
  height: var(--p1);
  border-radius: 100%;
  border: 2px dashed #ffffff0a;
  animation: orbit var(--sp) linear 0s infinite;
  display: flex; align-items: center;
  justify-content: center;
}

.planet:nth-child(3) {
  width: var(--p2);
  height: var(--p2);
  animation-duration: calc(var(--sp) * 0.5);
  animation-delay: -10s;
}


.planet:nth-child(4) {
  width: var(--p3);
  height: var(--p3);
  animation-duration: calc(var(--sp) * 1.5);
  animation-delay: -25s;
}


.planet:nth-child(5) {
  width: var(--p4);
  height: var(--p4);
  animation-duration: calc(var(--sp) * 2);
  animation-delay: -2s;
}


.planet:nth-child(6) {
  width: var(--p5);
  height: var(--p5);
  animation-duration: calc(var(--sp) * 2.5);
  animation-delay: -50s;
}

.planet:nth-child(7) {
  width: var(--p6);
  height: var(--p6);
  animation-duration: calc(var(--sp) * 3);
  animation-delay: -15s;
}








@keyframes ring {
  0% { transform: rotate(0deg) scale(2); }
  100% { transform: rotate(360deg) scale(2); }
}




.planet:before, 
.planet:after {
  --planet-color: hsl(var(--c1) 50% 50%);
  content: "";
  position: absolute;
  width: calc(var(--p1) / 12);
  height: calc(var(--p1) / 12);
  background: radial-gradient(circle at 50% 110%, var(--planet-color) 0 50%, #0008 75% 100%), var(--planet-color);
  border-radius: 100%;
  left: calc(50% - calc(calc(var(--p1) / 12) * -0.5));
  top: calc(calc(var(--p1) / 12) * -0.5);
  box-shadow: 0 0 1vmin 0 hsl(var(--c1) 50% 50%);
}

.planet:nth-child(3):before, 
.planet:nth-child(3):after {
  --planet-color: hsl(var(--c2) 50% 50%);
  width: calc(var(--p2) / 10);
  height: calc(var(--p2) / 10);
  left: calc(50% - calc(calc(var(--p2) / 10) * -0.5));
  top: calc(calc(var(--p2) / 10) * -0.5);
  box-shadow: 0 0 1vmin 0 hsl(var(--c2) 50% 50%);
}

.planet:nth-child(4):before, 
.planet:nth-child(4):after {
  --planet-color: hsl(var(--c3) 50% 50%);
  width: calc(var(--p3) / 9);
  height: calc(var(--p3) / 9);
  left: calc(50% - calc(calc(var(--p3) / 9) * -0.5));
  top: calc(calc(var(--p3) / 9) * -0.5);
  box-shadow: 0 0 1vmin 0 hsl(var(--c3) 50% 50%);
}

.planet:nth-child(5):before,
.planet:nth-child(5):after {
  --planet-color: hsl(var(--c4) 50% 50%);
  width: calc(var(--p4) / 13);
  height: calc(var(--p4) / 13);
  left: calc(50% - calc(calc(var(--p4) / 13) * -0.5));
  top: calc(calc(var(--p4) / 13) * -0.5);
  box-shadow: 0 0 1vmin 0 hsl(var(--c4) 50% 50%);
}

.planet:nth-child(6):before,
.planet:nth-child(6):after {
  --planet-color: hsl(var(--c5) 50% 50%);
  width: calc(var(--p5) / 15);
  height: calc(var(--p5) / 15);
  left: calc(50% - calc(calc(var(--p5) / 15) * -0.5));
  top: calc(calc(var(--p5) / 15) * -0.5);
  box-shadow: 0 0 1vmin 0 hsl(var(--c5) 50% 50%);
}

.planet:nth-child(7):before,
.planet:nth-child(7):after {
  --planet-color: hsl(var(--c6) 50% 50%);
  width: calc(var(--p6) / 18);
  height: calc(var(--p6) / 18);
  left: calc(50% - calc(calc(var(--p5) / 18) * -0.5));
  top: calc(calc(var(--p5) / 18) * -0.5);
  box-shadow: 0 0 1vmin 0 hsl(var(--c6) 50% 50%);
}


.planet:after {
  display: none;
}











.planet.ring:after {
  display: block;
  background: 
    radial-gradient(circle at 50% 6%, hsl(var(--c6) 50% 90%) 0 4%, #fff0 calc(4% + 1px)),
    repeating-radial-gradient(#fff0 0 2%, hsl(var(--c2) 50% 50%) calc(2% + 1px) 4%, hsl(var(--c4) 50% 50%) calc(4% + 1px) 6%, #fff0 calc(6% + 1px) 8%) !important;
  z-index: -1;
  animation: ring 5s linear 0s infinite;
  opacity: 0.15;
}

.planet.ring ~ .planet.ring:after {
  background: 
    radial-gradient(circle at 50% 6%, hsl(var(--c1) 50% 90%) 0 4%, #fff0 calc(4% + 1px)),
    repeating-radial-gradient(#fff0 0 2%, hsl(var(--c3) 50% 50%) calc(2% + 1px) 4%, hsl(var(--c5) 50% 50%) calc(4% + 1px) 5%, #fff0 calc(5% + 1px) 8%) !important;
  z-index: -1;
  animation: ring 15s linear 0s infinite;
  opacity: 0.125;
}

.planet.moon:after {
  display: block;
  background: 
    radial-gradient(circle at calc(20% + 1px) calc(20% + 1px), hsl(var(--c1) 10% 20%) 0 5%, #fff0 calc(5% + 1px)), 
    radial-gradient(circle at 50% 50%, #fff0 0 55%, #ffffff08 calc(55% + 1px) 56%, #fff0  calc(56% + 1px)) !important;
  box-shadow: none !important;
  animation: ring calc(var(--sp) / 10) linear 0s infinite;
  opacity: 0.85;
}

.planet.double-moon:after {
  display: block;
  background: 
    radial-gradient(circle at calc(20% + 1px) calc(20% + 1px), hsl(var(--c2) 10% 20%) 0 3%, #fff0 calc(3% + 1px)),   radial-gradient(circle at calc(80% + 1px) calc(80% + 1px), hsl(var(--c3) 10% 20%) 0 2%, #fff0 calc(2% + 1px)), radial-gradient(circle at 50% 50%, #fff0 0 40%, #ffffff10 50%, #fff0 60%), radial-gradient(circle at 50% 50%, #fff0 0 50%, #ffffff10 55%, #fff0 65%), radial-gradient(circle at 50% 50%, #fff0 0 60%, #ffffff08 calc(60% + 1px) 61%, #fff0  calc(73% + 1px)) !important;
  box-shadow: none !important;
  animation: ring calc(var(--sp) / 5) linear 0s infinite;
  opacity: 0.75;
}













button#random-planets {	
  position: absolute;
  bottom: 5vmin;
  border: 0;
  background: hsla(var(--c1), 50%, 50%, 0.125);
  text-transform: uppercase;
  font-family: Arial, Helvetica, serif;
  font-weight: bold;
  padding: 10px 20px 10px 22px;
  font-size: 15px;
  border-radius: 1px;
  cursor: pointer;
  border: 2px solid #fff8;
  box-sizing: border-box;
  color: #fffc;
  border-radius: 100px;	
  animation: satellite 5s ease -2s infinite alternate;
}


button#random-planets:hover {
  background: hsla(var(--c1), 50%, 50%, 0.25);
  border-color: #fffc;
  box-shadow: 0 0 1vmin 0 hsla(var(--c1), 50%, 50%, 0.75), 0 0 2vmin 0 #000c inset;
}




button#random-planets:before, button#random-planets:after {
  content: "";
  position: absolute;
  left: calc(calc(var(--p1) / 12) / -2);
  top: calc(calc(var(--p1) / 12) / -50);
  width: calc(var(--p1) / 12);
  height: calc(var(--p1) / 12);
  background: radial-gradient(circle at 50% -10%, hsl(var(--s2) 50% 50%) 0 50%, #0008 75% 100%),  hsl(var(--c2) 50% 50%);
  border-radius: 100%;
  border: 2px solid #fff6;
  animation: satellite 3s ease 0s infinite alternate;
}

@keyframes satellite {
  0% { transform: translateY(-6px); }
  100% { transform: translateY(12px); }
}

button#random-planets:after {
  left: inherit;
  right: calc(calc(var(--p1) / 20) / -2);
  top: calc(calc(var(--p1) / 20) / 1.25);
  width: calc(var(--p1) / 20);
  height: calc(var(--p1) / 20);
  box-sizing: border-box;
  background: radial-gradient(circle at 50% -10%, hsl(var(--c4) 50% 50%) 0 50%, #0008 75% 100%),  hsl(var(--c4) 50% 50%);
  animation-delay: -1s;
  animation-duration: 4s;
}














.asteroid {
  --brown: #251914;
  width: var(--a1);
  height: var(--a1);
  position: absolute;
  border-radius: 100%;
  z-index: -2;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: orbit calc(var(--sp) * 5) linear 0s infinite;
  opacity: 0.75;
}

.asteroid:before, .asteroid:after {
  --brown: #562716;
  content: "";
  width: 90%;
  height: 90%;
  position: absolute;
  border-radius: 100%;
  box-sizing: border-box;
  margin-left: -3px;
  filter: blur(3px);
  --ast1: var(--brown) 0.15vmin , #fff0 calc(0.15vmin + 1px);
  --ast2: var(--brown) 0.25vmin , #fff0 calc(0.25vmin + 1px);
  --ast3: var(--brown) 0.5vmin , #fff0 calc(0.5vmin + 1px);
  --ast4: var(--brown) 0.75vmin , #fff0 calc(0.75vmin + 1px);
  --ast5: var(--brown) 1vmin , #fff0 calc(1vmin + 1px);
  background: 
    radial-gradient(circle at 50% 4%, var(--ast1)), 
    radial-gradient(circle at 55% 4%, var(--ast1)), 
    radial-gradient(circle at 45% 5%, var(--ast1)), 
    radial-gradient(circle at 53% 5%, var(--ast1)), 
    radial-gradient(circle at 47% 3%, var(--ast1)),

    radial-gradient(circle at 42% 7%, var(--ast2)), 
    radial-gradient(circle at 48% 2%, var(--ast2)), 
    radial-gradient(circle at 56% 7%, var(--ast2)), 
    radial-gradient(circle at 59% 6%, var(--ast2)), 
    radial-gradient(circle at 38% 7%, var(--ast2)),

    radial-gradient(circle at 60% 8%, var(--ast3)), 
    radial-gradient(circle at 65% 6%, var(--ast3)), 
    radial-gradient(circle at 49% 6%, var(--ast3)), 
    radial-gradient(circle at 70% 10%, var(--ast3)), 
    radial-gradient(circle at 27% 13%, var(--ast3)),

    radial-gradient(circle at 40% 5%, var(--ast4)), 
    radial-gradient(circle at 63% 7%, var(--ast4)), 
    radial-gradient(circle at 34% 9%, var(--ast4)), 
    radial-gradient(circle at 22% 14%, var(--ast4)), 
    radial-gradient(circle at 72% 13%, var(--ast4)),

    radial-gradient(circle at 25% 12%, var(--ast5)), 
    radial-gradient(circle at 37% 5%, var(--ast5)), 
    radial-gradient(circle at 30% 11%, var(--ast5)), 
    radial-gradient(circle at 4% 45%, var(--ast5)), 
    radial-gradient(circle at 3% 59%, var(--ast5)),

    radial-gradient(circle at 3% 41%, var(--ast1)), 
    radial-gradient(circle at 30% 8%, var(--ast1)), 
    radial-gradient(circle at 27% 9%, var(--ast1)), 
    radial-gradient(circle at 19% 19%, var(--ast1)), 
    radial-gradient(circle at 16% 16%, var(--ast1)),

    radial-gradient(circle at 7% 29%, var(--ast2)), 
    radial-gradient(circle at 24% 15%, var(--ast2)), 
    radial-gradient(circle at 18% 17%, var(--ast2)), 
    radial-gradient(circle at 13% 22%, var(--ast2)), 
    radial-gradient(circle at 16% 21%, var(--ast2)),

    radial-gradient(circle at 20% 16%, var(--ast3)), 
    radial-gradient(circle at 32% 7%, var(--ast3)), 
    radial-gradient(circle at 17% 19%, var(--ast3)), 
    radial-gradient(circle at 6% 33%, var(--ast3)), 
    radial-gradient(circle at 11% 29%, var(--ast3)),

    radial-gradient(circle at 14% 19%, var(--ast4)), 
    radial-gradient(circle at 6% 40%, var(--ast4)), 
    radial-gradient(circle at 8% 27%, var(--ast4)), 
    radial-gradient(circle at 3% 49%, var(--ast4)), 
    radial-gradient(circle at 5% 56%, var(--ast4)),

    radial-gradient(circle at 7% 67%, var(--ast5)), 
    radial-gradient(circle at 15% 23%, var(--ast5)), 
    radial-gradient(circle at 12% 25%, var(--ast5)), 
    radial-gradient(circle at 9% 31%, var(--ast5)), 
    radial-gradient(circle at 6% 36%, var(--ast5)),

    radial-gradient(circle at 12% 72%, var(--ast1)), 
    radial-gradient(circle at 77% 14%, var(--ast1)), 
    radial-gradient(circle at 84% 22%, var(--ast1)), 
    radial-gradient(circle at 96% 36%, var(--ast1)), 
    radial-gradient(circle at 97% 46%, var(--ast1)),

    radial-gradient(circle at 8% 36%, var(--ast2)), 
    radial-gradient(circle at 10% 26%, var(--ast2)), 
    radial-gradient(circle at 10% 71%, var(--ast2)), 
    radial-gradient(circle at 20% 82%, var(--ast2)), 
    radial-gradient(circle at 33% 91%, var(--ast2)),

    radial-gradient(circle at 78% 16%, var(--ast3)), 
    radial-gradient(circle at 87% 24%, var(--ast3)), 
    radial-gradient(circle at 93% 37%, var(--ast3)), 
    radial-gradient(circle at 93% 30%, var(--ast3)), 
    radial-gradient(circle at 95% 49%, var(--ast3)),

    radial-gradient(circle at 52% 3%, var(--ast4)), 
    radial-gradient(circle at 84% 19%, var(--ast4)), 
    radial-gradient(circle at 91% 28%, var(--ast4)), 
    radial-gradient(circle at 96% 38%, var(--ast4)), 
    radial-gradient(circle at 81% 16%, var(--ast4)),

    radial-gradient(circle at 14% 78%, var(--ast5)), 
    radial-gradient(circle at 25% 87%, var(--ast5)), 
    radial-gradient(circle at 55% 95%, var(--ast5)), 
    radial-gradient(circle at 42% 96%, var(--ast5)), 
    radial-gradient(circle at 35% 91%, var(--ast5));
}

.asteroid:after {
  transform: rotate(180deg);
}

.belt {
  position: absolute;
  width: 110%;
  height: 110%;
  background: radial-gradient(#fff0 35%, var(--brown) 53%, #fff0 67%);
  border-radius: 100%;
  z-index: 2;
}
              
            
!

JS

              
                
function randomNumber(max, min) {
	return Math.floor(Math.random() * max) + min;
}

function setProp(p, n) {
	document.body.style.setProperty(p, n);
}

function getProp(name) {
	return document.body.style.getPropertyValue(name);
}


function randomPlanets() {

	var delRings = document.querySelectorAll(".ring");
	for (var i=0; i<delRings.length; i++){
		delRings[i].classList.remove('ring');
	}
	document.querySelector(".moon").classList.remove('moon');
	document.querySelector(".double-moon").classList.remove('double-moon');
	

	/*colors*/
	setProp("--c1", randomNumber(359, 1));
	setProp("--c2", parseInt(getProp("--c1")) + 45);
	setProp("--c3", parseInt(getProp("--c1")) + 90);
	setProp("--c4", parseInt(getProp("--c1")) + 135);
	setProp("--c5", parseInt(getProp("--c1")) + 180);
	setProp("--c6", parseInt(getProp("--c1")) + 225);

	/*saturation*/
	setProp("--sat", randomNumber(70, 20) + "%");  

	/*star size*/
	setProp("--s1", randomNumber(10, 5) + "vmin");
	/*star color*/
	setProp("--s2", randomNumber(90, 0));

	/*planet size*/
	setProp("--p1", randomNumber(8, 20) + "vmin");
	setProp("--p2", randomNumber(10, 30) + "vmin");
	setProp("--p3", randomNumber(9, 45) + "vmin");
	setProp("--p4", randomNumber(17, 58) + "vmin");
	setProp("--p5", randomNumber(20, 85) + "vmin");
	setProp("--p6", randomNumber(8, 110) + "vmin");


	//planet speed
	setProp("--sp", randomNumber(20, 20) + "s");


  
	/*asteroid size*/
	setProp("--a1", randomNumber(111, 28) + "vmin");
  
  
	//target
	var setTarget = document.querySelectorAll(".system > div");
	
	//ring
	var setRing = randomNumber(6, 1);
	setTarget[setRing].classList.add('ring');
	var setRing2;
	if(setRing<4) setRing2=setRing+2; else setRing2=setRing-2;
	setTarget[setRing2].classList.add('ring');

	//moon
	var setMoon = randomNumber(6, 1);
	setTarget[setMoon].classList.add('moon');
	
	//double moon
	var setDoubleMoon = randomNumber(6, 1);
	setTarget[setDoubleMoon].classList.add('double-moon');




}






randomPlanets();
              
            
!
999px

Console