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HTML

              
                <div class="fondo" id="fondo">

  <div class="luz" id="luz"></div>
  <div class="lampara" id="lampara"></div>
  <div class="lampara2" id="lampara2"></div>
  <div class="cable" id="cable"></div>
  <div class="caragrande"></div>
  
  <div class="contenedor">q
  
  <div class="cuadro1" id="cuadro1"></div>
  <div class="cuadro2" id="cuadro2"></div>
  <div class="cuadro3" id="cuadro3"></div>
  <div class="cuadro4" id="cuadro4"></div>
  <div class="cuerpo-gato1" id="cuerpo-gato1"></div>
  <div class="cabeza-gato1" id="cabeza-gato1"></div>
  <div class="oreja1"></div>
  <div class="oreja2"></div>
  <div class="rabo1"></div>
  <div class="rabo2"></div>
  <div class="bigote1"></div>
  <div class="bigote2"></div>
  <div class="bigote3"></div>
  <div class="bigote4"></div>
  <div class="bigote5"></div>
  <div class="bigote6"></div>
  <div class="sol" id="sol"></div>
   <div class="sol2" id="sol2"></div>
 
  <div class="luna1" id="luna1"></div>
  <div class="luna2" id="luna2"></div>
  
  <div class="estrellas-efectos" id="todas_estrellas">
    <ul>
   <li class="estrella" id ="estrella1"></li>
   <li class="estrella" id ="estrella2"></li>
   <li class="estrella" id ="estrella3"></li>
   <li class="estrella" id ="estrella4"></li>
   <li class="estrella" id ="estrella5"></li>
   <li class="estrella" id ="estrella6"></li>
   <li class="estrella" id="estrella7"></li>
   <li class="estrella" id="estrella8"></li>
   <li class="estrella" id="estrella9"></li>
   <li class="estrella" id="estrella10"></li>
   <li class="estrella" id="estrella11"></li>
   <li class="estrella" id="estrella12"></li>
   <li class="estrella" id="estrella13"></li>
   <li class="estrella" id="estrellafugaz"></li>
      
</ul>
  </div>
</div>
<div class ="buttons">
  <button class="noche" id="boton_noche"> Me gusta la noche --></button>
   <button class="luna" id="boton_luna">La luz de la luna -></button>
  <button class="estrellas" id="boton_estrellas"> ... y las estrellas -> </button>
   <button class="deseo" id="boton_deseo"> Pide un deseo --> </button>
  
</div>
 
   
</div>

              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css2?family=Schoolbell&display=swap');

*{
  font-family: 'Schoolbell', cursive;
  font-size: 1.1em;
 --blue: #38A9A6;
 --sky-blue: #A9D4E7;
 --green: #9ECDA5;
 --soft-green: #DFE8BC;
 --dark: #483E35;
 --color: #D06D6C; 
  --yellow: #DD8344;
  --night: #111A32;
}

.fondo {
  background-color: var(--blue);
  padding: 3em;
  position: relative;
  width: 1500px;
  margin-left: auto; 
  margin-right: auto;
}

.contenedor
{
  position: relative;
  width: 400px;
  height: 400px;
  border: solid 3px var(--dark);
  margin-left: auto;
  margin-right: auto;
  background-color: var(--color);
  box-shadow: 5px 5px 5px  var(--dark);
  
}

.buttons {
  display: relative;
}

.luz{
  position:absolute;
  border-width: 280px;
  border-style: solid;
  border-color: transparent rgba(70, 200, 163, 0.363)  rgba(70, 200, 163, 0.363) transparent;
  left: 62.9%;
  top: 40%;
  transform: rotate(225deg);
  z-index:1;
}

.lampara{
   position:absolute;
  border-width: 80px;
  border-style: solid;
  border-color: transparent var(--dark) var(--dark)
  transparent;
  left: 75.5%;
  top: 11%;
  transform: rotate(225deg);
  border-radius: 30%;
  z-index:3;
  
}

.lampara2{
   position:absolute;
  border-width: 30px;
  border-style: solid;
  border-color: yellow;
 z-index:2;
  left: 78.6%;
  top: 19%;
  transform: rotate(225deg);
  border-radius: 50%;
}


.cable{
  position: absolute;
  width: 10px;
  height: 100px;  ;  
  top: 0%;
  right: 18.9%;
  background-color: var(--dark);
  border-width: 5px;
  border-color: gray;
  border-style: solid;
  border-radius: 50%;
}


.cuadro1
{
  position: absolute;
  border: 1px solid black;
  width: 185px;
  height: 185px;
  top:2%;
  left: 2%;
  z-index: 2;
  background-color: var(--sky-blue);
}

.cuadro2
{
  position: absolute;
  z-index: 2;
  border: 1px solid black;
  width: 185px;
  height: 185px;
  top:2%;
  left: 51%;
  background-color: white;
  background-color: var(--sky-blue);
}

.cuadro3
{
  position: absolute;
  z-index: 2;
  border: 1px solid black;
  width: 185px;
  height: 185px;
  top:51%;
  left: 51%;
  background-color: var(--sky-blue);
}

.cuadro4
{
  position: absolute;
  z-index: 2;
  border: 1px solid black;
  width: 185px;
  height: 185px;
  top:51%;
  left: 2%;
  background-color: var(--sky-blue);
}

.cuerpo-gato1
{
  position: absolute;
  z-index: 3;
  border: 1px solid black;
  width: 70px; 
  height: 90px;
  border-radius: 50% 50% 29% 29%;
  top: 74.5%;
  right: 10%; 
  background: black;
  
}

.sol {
  position: absolute;
  z-index: 3;
 
  width: 50px; 
  height: 50px;
  border-radius: 50%;
  top: 11.5%;
  right: 72%; 
  background: var(--yellow);
}

.sol2{
  position: absolute;
  z-index: 2;
  width: 60px; 
  height: 60px;
  border-radius: 50%;
  top: 10.6%;
  right: 70.9%; 
  background: yellow;
}

.cabeza-gato1
{
  position: absolute;
  z-index: 3;
  width: 45px;
  height: 38px;
  border: 1px solid black;
  border-radius: 48%;
  top: 66%;
  right: 13.6%;
  background: black;
}

.oreja1
{
  position: absolute;
  z-index: 3;
  top: 62.2%;
  right: 21%;
  border-color: transparent transparent black;
  border-width: 12.5px;
  border-style: solid;
  transform: rotate(-33deg);
 
}

.oreja2
{
  position: absolute;
  z-index: 3;
  top: 61.5%;
  right: 12.5%;
  border-color: transparent transparent black;
  border-width: 12.5px;
  border-style: solid;
  transform: rotate(25deg);
 
}

.rabo1
{
  position:absolute;
  z-index: 3;
  width: 120px; 
  height: 100px;  
  border: solid 11px #000;
  border-color: #000 transparent transparent transparent;
  border-radius: 50%/100px 100px 0 0;
  transform: rotate(120deg);
  top: 80%;
  right: 15%;
   animation-iteration-count: infinite;
   animation-duration: 3s;
  animation-name: slidein;

}



.rabo2
{
  position: absolute;
  z-index: 3;
  width: 13px;
  height: 17px;
  background-color: black;
  top: 106%;
  right:29%;
  border-radius: 50%;
  transform: rotate(60deg);
  
}

.bigote1
{
  position: absolute;
  z-index: 4;
  width: 50px; 
  height: 100px;  
  border: solid 2px #000;
  border-color: #000 transparent transparent transparent;
  border-radius: 50%/100px 100px 0 0;
  
  top: 72%;
  right: 21%;
  transform: rotate(30deg);
  
}

.bigote2
{
  position: absolute;
  z-index: 4;
  width: 50px; 
  height: 100px;  
  border: solid 2px #000;
  border-color: #000 transparent transparent transparent;
  border-radius: 50%/100px 100px 0 0;
  top: 70%;
  right: 22%;
  transform: rotate(30deg);
  
}

.bigote3{
  position: absolute;
  z-index: 4;
  width: 50px; 
  height: 100px;  
  border: solid 2px #000;
  border-color: #000 transparent transparent transparent;
  border-radius: 50%/100px 100px 0 0;
  top: 71%;
  right: 21%;
  transform: rotate(30deg);
}

.bigote4
{
  position: absolute;
  z-index: 4;
  width: 20px;
  border: solid 1px #000;
  top: 70%;
  right: 12%;
  transform: rotate(20deg);
}

.bigote5
{
  position: absolute;
  z-index: 4;
  width: 20px;
  border: solid 1px #000;
  top: 71%;
  right: 12%;
  transform: rotate(20deg);
}

.bigote6
{
  position: absolute;
  z-index: 4;
  width: 20px;
  border: solid 1px #000;
  top: 72%;
  right: 12%;
  transform: rotate(20deg);
}

button
{
 position: absolute;
 width:220px;
 height: 70px;
 box-shadow: 0 0 40px #fff;
}

.noche{
 position: absolute;
 z-index: 4;
 left:18%;
 top: 35%;
 background-color:#C2B769;
}

.luna
{
 z-index: 4;
 left: 18%;
 top: 35%;
 background-color: pink;
}

.luna1
{
  position: absolute;
  z-index: 6;
  width: 60px;
  height: 60px;
  top: 10%;
  left: 13%;
  border-radius: 50%;
  background-color: white;
  box-shadow: 0 0 8.5px #fff;
  
}

.luna2
{
  position: absolute;
  z-index: 7;
  width: 60px;
  height: 60px;
  top: 10%;
  left: 18%;
  border-radius: 50%;
  background-color:var(--night);
  
}

.estrellas {
 z-index: 7;
 left: 18%;
 top: 35%;
 background-color: yellow;
}

.deseo {
  z-index: 7;
  left:18%;
  top:35%;
  background-color: orange;
  
}

.estrella {
  position: absolute;
  z-index: 7;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: yellow;
}

#estrella1 {
  top: 30%;
  left:35%;
}

#estrella2 {
  top: 20%;
  left:65%;
}

#estrella3 {
  top: 10%;
  left:75%;
}

#estrella4 {
  top: 35%;
  left:75%;
}

#estrella5 {
  top: 60%;
  left:25%;
}

#estrella6{
  top: 70%;
  left: 60%;
}

#estrella7 {
  top: 59%;
  left: 89%;
}

#estrella8 {
  top: 6%;
  left: 92%;
}

#estrella9 {
  top: 21%;
  left: 4%;
}

#estrella10 {
  top: 9%;
  left: 32%;
}

#estrella11 {
  top: 13%;
  left: 62%;
}

#estrella12 {
  top: 32%;
  left: 12%;
}

#estrella13 {
  top: 38%;
  left: 39%;
}


#estrellafugaz {
  top: 45%;
  left: 5%;
  animation-name: spin;
  animation-duration: 4s;
  animation-iteration-count: 1;
  width: 5px;
  height: 5px;
  border-radius: 50%;
   
}


@keyframes spin {
 from {
  
    width: 1%; 
  }

  75% {
   top: 10%;
    margin-left: 25%;
    width: 1%;
  }

  to {
    margin-left: 0%;
    width: 0%;
    
  }
}


button {
  font-size: 0.8em;
   opacity: .8;
    transition: all 300ms linear;
}

button:hover {
    transition: all 150ms linear;
    background: white;
  }
              
            
!

JS

              
                let cuadro1 = document.getElementById("cuadro1");
let cuadro2 = document.getElementById("cuadro2");
let cuadro3 = document.getElementById("cuadro3");
let cuadro4 = document.getElementById("cuadro4");
let pared = document.getElementById("fondo");
let estrella1 = document.getElementById("estrella1");
let estrella2 = document.getElementById("estrella2");
let estrella3 = document.getElementById("estrella3");
let estrella4 = document.getElementById("estrella4");
let estrella5 = document.getElementById("estrella5");
let estrella6 = document.getElementById("estrella6");
let estrella7 = document.getElementById("estrella7");
let estrella8 = document.getElementById("estrella8");
let estrella9 = document.getElementById("estrella9");
let estrella10 = document.getElementById("estrella10");
let estrella11 = document.getElementById("estrella11");
let estrella12 = document.getElementById("estrella12");
let estrella13 = document.getElementById("estrella13");




let button_noche = document.getElementById("boton_noche");

let luna1 = document.getElementById("luna1");
let luna2 = document.getElementById("luna2");

let button_luna = document.getElementById("boton_luna");


let estrellafugaz = document.getElementById("estrellafugaz");

let button_fugaz = document.getElementById("boton_deseo");

let button_estrellas = document.getElementById("boton_estrellas");

let sol = document.getElementById("sol");
let sol2 = document.getElementById("sol2");

let cuerpo_de_gato = document.getElementById("cuerpo-gato1");

let cabeza_de_gato = document.getElementById("cabeza-gato1");

let luz = document.getElementById("luz");
let lampara2 = document.getElementById("lampara2");


window.onload = function(){
  button_luna.style.display = "none";
  luna1.style.display = "none";
  luna2.style.display = "none";
  button_estrellas.style.display = "none";
  button_fugaz.style.display = "none";
  luz.style.display = "none";
  lampara2.style.borderColor = "white";
  estrella1.style.display = "none";
  estrella2.style.display = "none";
  estrella3.style.display = "none";
  estrella4.style.display = "none";
  estrella5.style.display = "none";
  estrella6.style.display = "none";
  estrella7.style.display = "none";
  estrella8.style.display = "none";
  estrella9.style.display = "none";
  estrella10.style.display = "none";
  estrella11.style.display = "none";
  estrella12.style.display = "none";
  estrella13.style.display = "none";
  
  estrellafugaz.style.display = "none";
}


button_noche.onclick = function() {
  cuadro1.style.backgroundColor = "var(--night)";
  cuadro2.style.backgroundColor = "var(--night)";
  cuadro3.style.backgroundColor = "var(--night)";
  cuadro4.style.backgroundColor = "var(--night)";
  button_luna.style.display = "block";
  button_noche.style.display  = "none";
  sol.style.display = "none";
  sol2.style.display = "none";
  lampara2.style.borderColor = "yellow";
  luz.style.display = "block";
  pared.style.backgroundColor = "rgb(40, 116, 113)";
  estrellafugaz.style.display = "none";
                      
}

button_luna.onclick = function(){
  luna1.style.display = "block";
  luna2.style.display = "block";
  button_estrellas.style.display = "block";
  button_luna.style.display = "none";          cuerpo_de_gato.style.boxShadow = "0px 0px 30px #fff";
 
}


button_estrellas.onclick = function(){
  estrella1.style.display = "block";
  estrella2.style.display = "block";
  estrella3.style.display = "block";
  estrella4.style.display = "block";
  estrella5.style.display = "block";
  estrella6.style.display = "block";
  estrella7.style.display = "block";
  estrella8.style.display = "block";
  estrella9.style.display = "block";
  estrella10.style.display = "block";
  estrella11.style.display = "block";
  estrella12.style.display = "block";
  estrella13.style.display = "block";
 
  button_fugaz.style.display = "block";
  button_estrellas.style.display = "none";

}

button_fugaz.onclick = function() {
 
  button_estrellas.style.display = "none";
  estrellafugaz.style.display = "block";
  setTimeout(desactivarEstrella, 3000);
}


function getRandomInt(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function getRandomColor() {
  const red = getRandomInt(0, 255);
  const green = getRandomInt(0, 255);
  const blue = getRandomInt(0, 255);

  return `rgb(${red}, ${green}, ${blue})`;
}

const stars = document.querySelectorAll("li");

function colorStar() {
  const chosen = stars[getRandomInt(0, stars.length - 1)];
  chosen.style.backgroundColor = getRandomColor();
}

setInterval(colorStar, 20);

function desactivarEstrella (){
    estrellafugaz.style.display = "none";
  }



              
            
!
999px

Console