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HTML 

              
                .box
  .sky
    .star
    .moon
  .head#player
    .head-copy
    .ear-left
      .inner-ear
    .ear-right
      .inner-ear
    .eye-left
       .pupil
    .eye-right
       .pupil
    .nose
    .upper-nose
    .circle
    .hair
    .mouth
    .body
button.button Move me
button.button#stopMe Stop me
!

CSS 

              
                // colors
$pink: #6E3B7D;
$red: #B54151;
$orange: #B67CAD;
$white: #C0E0DE;
$blue: #5688C7;
$yellow: #FDD748;
$sweet-brown: #AD343E;
$rich-black: #050505;

$circle: 50%;

body {
  background: $rich-black;
}

.head {
  position: absolute;
  top: 16.5%;
  left: 25%;
  width: 50%;
  height: 67%;
  background: $pink;
  border-radius: $circle;
  animation: moveMe 13s infinite; 
}

.inner-ear {
  position: absolute;
  border-radius: 50%;
  width: 80%;
  height: 80%;
  top: -2%;
  left: 10%;
  background: $orange; 
}

.ear-left {
  position: absolute;
  border-radius: 50%;
  width: 10%;
  height: 15%;
  top: 25%;
  left: -4%;
  background: $yellow;
  z-index: 2;
}

.ear-right {
  position: absolute;
  border-radius: 50%;
  width: 10%;
  height: 15%;
  top: 30%;
  right: -5%;
  background: $yellow;
}

.eye-right {
  position: absolute;
  border-radius: 40%;
  width: 20%;
  height: 20%;
  top: 20%;
  right: 20%;
  background: $white;
}

.eye-left {
  position: absolute;
  border-radius: 40%;
  width: 20%;
  height: 20%;
  top: 20%;
  left: 20%;
  background: $white;
}

.pupil {
  position: absolute;
  border-radius: 40%;
  width: 20%;
  height: 30%;
  top: 20%;
  left: 20%;
  background: black;
}

.mouth {
  position: absolute;
  border-radius: 50%;
  width: 20%;
  height: 10%;
  bottom: 20%;
  left: 40%;
  top: 65%;
  background: $white
}

.nose {
  position: absolute;
  border-radius: 100%;
  width: 20%;
  height: 15%;
  top: 40%;
  right: 40%;
  background: $white;
  
}

.upper-nose {
  position: absolute;
  width: 20%;
  height: 15%;
  top: 30.1%;
  right: 40%;
  background: $white;
  -webkit-clip-path: polygon(100% 100%, 56% 0, 0 100%);
clip-path: polygon(100% 100%, 56% 0, 0 100%);
  z-index: 1;
}

.circle {
  position: absolute;
  width: 8%;
  height: 8%;
  top: 5.0%;
  right: 45%;
  background: $red;
  border-radius: 50%;
}

.hair {
  position: absolute;
  width: 20%;
  height: 5%;
  top: -4%;
  right: 40%;
  background: $white;
  -webkit-clip-path: polygon(100% 100%, 56% 0, 0 100%);
clip-path: polygon(100% 100%, 56% 0, 0 100%);
  z-index: 1;
}

.body {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 95.0%;
  right: 5%;
  background: $sweet-brown;
  border-radius: 50%;
  z-index: -1;
}

.star {
  position: absolute;
  top: 16.5%;
  left: 70%;
  width: 5%;
  height: 15%;
  background: $yellow;
  border-radius: $circle;
  -webkit-clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
  animation: spinMe 3s infinite; 
}

.moon {
  position: absolute;
  top: 0%;
  right: 0%;
  width: 15%;
  height: 100%;
  background: $white;
  -webkit-clip-path: circle(50% at 100% 27%);
clip-path: circle(50% at 100% 27%);
}

.moon:hover {
  animation: moveMe 3s infinite; 
}
 
// large screens
@media all and (min-width: 600px) {
  .head {
    width: 20%;
  }
}

// portrait screens
@media all and (max-height: 150px) {
  .head {
    width: 10%;
    border-radius: 50%;
  }
}

// portrait screens
@media all and (min-height: 400px) {
  .head {
    height: 30%;
  }
}

//CSS animations
//animation of spinMe
@keyFrames spinMe {
  0%{
    transform: rotate(0deg); 
  }

  100%{
    transform: rotate(360deg);
   
  }
}

@keyFrames moveMe {
  0%{
     transform: translate(0px, 0px);
  }
  100%{
     transform: translate(10px, 100px);
  }
 
}

@keyFrames stopMe {
  0%{
     transform: translate(0px, 0px);
  }
  100%{
     transform: translate(0px, 0px);
  }
 
}

.button {
  height: 50px;
  top: 0;
  width: 15%;
  text-align: center;
  background-color: #FDAD00;
}

.movePlayer {
  animation: moveMe 1s infinite; 
}

.stopPlayer {
  animation: stopMe 1s infinite; 
}
!

JS 

              
                // buttons
let player = document.getElementById("player");
let moveMe = document.querySelector("button");
let stopMe = document.getElementById("stopMe");


  moveMe.addEventListener("click", () => {
 
 player.classList.add("movePlayer");
    player.className += ' movePlayer'; 
    player.classList.remove("stopMe");
    
    
    
  });


stopMe.addEventListener("click", () => {
 console.log("hi")
 stopMe.classList.add("stopMe");
    player.className += ' stopPlayer'; 
    player.classList.remove("moveMe");
    
  });
!
999px

Console