CodePen Embed - interactive kitten

<body>

  <div class="outer_wrapper">
    <div class="wrapper">

      <div class="cat_wrapper">
        <div class="cat first_pose">
          <div class="cat_head">
            <svg x="0px" y="0px" width="100%" height="100%" viewBox="0 0 76.4 61.2" >
              <polygon class="eyes" points="63.8,54.1 50.7,54.1 50.7,59.6 27.1,59.6 27.1,54.1 12.4,54.1 12.4,31.8 63.8,31.8 "/>
              <path d="M15.3,45.9h5.1V35.7h-5.1C15.3,35.7,15.3,45.9,15.3,45.9z M45.8,56.1V51H30.6v5.1H45.8z M61.1,35.7H56v10.2h5.1
                V35.7z M10.2,61.2v-5.1H5.1V51H0V25.5h5.1V15.3h5.1V5.1h5.1V0h5.1v5.1h5.1v5.1h5.1v5.1c0,0,15.2,0,15.2,0v-5.1h5.1V5.1H56V0h5.1v5.1
                h5.1v10.2h5.1v10.2h5.1l0,25.5h-5.1v5.1h-5.1v5.1H10.2z"/>
            </svg>

          </div>
          <div class="body">
            <svg x="0px" y="0px" width="100%" height="100%" viewBox="0 0 91.7 40.8" >
              <path class="st0" d="M91.7,40.8H0V10.2h5.1V5.1h5.1V0h66.2v5.1h10.2v5.1h5.1L91.7,40.8z"/>
            </svg>

            <div class="tail">
              <svg x="0px" y="0px" width="100%" height="100%" viewBox="0 0 25.5 61.1" >
                <polygon class="st0" points="10.2,56 10.2,50.9 5.1,50.9 5.1,40.7 0,40.7 0,20.4 5.1,20.4 5.1,10.2 10.2,10.2 10.2,5.1 15.3,5.1 
                  15.3,0 25.5,0 25.5,10.2 20.4,10.2 20.4,15.3 15.3,15.3 15.3,20.4 10.2,20.4 10.2,40.7 15.3,40.7 15.3,45.8 20.4,45.8 20.4,50.9 
                  25.5,50.9 25.5,61.1 15.3,61.1 15.3,56 "/>
              </svg>
            </div>
          </div>
          
          <div class="front_legs">
            <div class="leg one">
              <svg x="0px" y="0px" width="100%" height="100%" viewBox="0 0 14 30.5" >
                <polygon points="15.3,30.5 5.1,30.5 5.1,25.4 0,25.4 0,0 15.3,0 "/>
              </svg>
            </div>
            <div class="leg two">
              <svg x="0px" y="0px" width="100%" height="100%" viewBox="0 0 14 30.5" >
                <polygon points="15.3,30.5 5.1,30.5 5.1,25.4 0,25.4 0,0 15.3,0 "/>
              </svg>
            </div>  
          </div>
          
          <div class="back_legs">
            <div class="leg three">
              <svg x="0px" y="0px" width="100%" height="100%" viewBox="0 0 14 30.5" >
                <polygon points="15.3,30.5 5.1,30.5 5.1,25.4 0,25.4 0,0 15.3,0 "/>
              </svg>
            </div>
            <div class="leg four">
              <svg x="0px" y="0px" width="100%" height="100%" viewBox="0 0 14 30.5" >
                <polygon points="15.3,30.5 5.1,30.5 5.1,25.4 0,25.4 0,0 15.3,0 "/>
              </svg>
            </div>
          </div>
        </div>
      </div>
    </div>
    
    <div class="ground"></div>

  </div>

    
  <div class="sign">
    by masahito / <a href="http://www.ma5a.com/" >ma5a.com</a>
  </div>


</body>


* {
  box-sizing: border-box;
}

body {
  padding: 0;
  margin: 0;
  font-family: sans-serif;
  background-color: #63ec85;
}

.outer_wrapper {
  position: absolute;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.wrapper {
  position: absolute;
  height: calc(100vh - 100px);
  width: 100%;
  top: 0;
}

.ground {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 150px;
  background-color: rgb(1, 143, 96);
}

.cat {
  position: absolute;
  bottom: 65px;
  left: 100px;
  height: 30px;
  width: 60px;
  transition: 1.5s;
  transform-origin: center;
  background-color: transparent;
}

/* body */

.body {
  position: absolute;
  height: 30px;
  width: 60px;
}

.face_left .body { 
  animation: turn_body_left forwards 0.5s;
}

@keyframes turn_body_left {
  0%,100% { transform: scale(1); }
  50% { transform: scale(0.5, 1); }
}

.face_right .body {
  animation: turn_body_right forwards 0.5s;
}

@keyframes turn_body_right {
  0%,100% { transform: scale(1); }
  50% { transform: scale(0.5, 1); }
}

/* head */
.cat_head {
  position: absolute;
  height: 40px;
  width: 48px;
  right: -10px;
  top: -30px;
  transition: 0.5s;
  z-index: 50;
}

.first_pose .cat_head,
.face_left .cat_head{ 
  right: 22px;
}


/* tail */
.tail {
  position: absolute;
  top: -25px;
  height: 36px;
  width: 15px;
  animation: tail_motion forwards 2s;
  transform-origin: bottom right;
}

@keyframes tail_motion {
  0%,100% { 
    left: -5px;
    transform: rotate(0deg) scale(1); 
  }
  50% { 
    left: -10px;
    transform: rotate(-50deg) scale(-1,1); 
  }
}

.first_pose .tail ,
.face_left .tail {
  left: 45px;
  animation: tail_motion_alt forwards 2s;
}

@keyframes tail_motion_alt {
  0%,100% { 
    left: 45px;
    transform: rotate(0deg) scale(1); 
  }
  50% { 
    left: 40px;
    transform: rotate(50deg) scale(-1,1); 
  }
}



/* legs */
.leg {
  position: absolute;
  height: 20px;
  width: 10px;
  transform-origin: top center;
}

.front_legs,
.back_legs {
  position: absolute;
  height: 30px;
  transition: 0.7s;
}

.front_legs {
  width: 30px;
  right: 0;
}

.back_legs {
  width: 25px;
  left: 0; 
}

.face_left .leg svg {
  transform: scale(-1,1);
}

.face_right .front_legs{ right: 0; }

.first_pose .front_legs,
.face_left .front_legs{ right: 30px; }

.face_right .back_legs{ left: 0; }

.first_pose .back_legs,
.face_left .back_legs{ left: 35px; }

.one,
.three  {
  bottom: -15px;
  right: 0;
}

.two, 
.four {
  bottom: -15px;
  left: 0px;
}

.one.walk, 
.three.walk {
  animation: infinite 0.3s walk;
}

.two.walk, 
.four.walk {
  animation: infinite 0.3s walk_alt;
}

@keyframes walk {
  0%,100% {transform: rotate(-10deg);}
  50% {transform: rotate(10deg);}
}

@keyframes walk_alt {
  0%,100% {transform: rotate(10deg);}
  50% {transform: rotate(-10deg);}
}


/* jump */
.cat_wrapper {
  position: absolute;
  bottom: 0;
}

.cat_wrapper.jump .one { 
  animation: infinite 0.3s walk;
}

.cat_wrapper.jump .two { 
  animation: infinite 0.3s walk_alt;
}

.cat_wrapper.jump .three,
.cat_wrapper.jump .four {
  animation: none;
}

.cat_wrapper.jump .cat.face_right .back_legs {
  transform-origin: center;
  transform: rotate(50deg);
}

.cat_wrapper.jump .cat.face_left .back_legs {
  transform-origin: center;
  transform: rotate(-50deg);
}

.cat_wrapper.jump .cat.face_right .front_legs {
  transform-origin: center;
  transform: rotate(-60deg);
}

.cat_wrapper.jump .cat.face_left .front_legs {
  transform-origin: center;
  transform: rotate(60deg);
}

.cat_wrapper.jump{
  animation: jump forwards 1s;
}

@keyframes jump {
  0%, 100%  {bottom: 0px;}
  50% {bottom: 200px;}
}

.jump .face_left{ 
  animation: forwards 0.5s body_stand_left;
  transform-origin: right bottom;
}

.jump .face_right{ 
  animation: forwards 0.5s body_stand_right;
  transform-origin: left bottom;
}

@keyframes body_stand_right {
  0% {transform: rotate(0deg);}
  100% {transform: rotate(-45deg);}
}

@keyframes body_stand_left {
  0% {transform: rotate(0deg);}
  100% {transform: rotate(45deg);}
}

svg {
  height: 100%;
  width: 100%;
}

polygon.eyes {
  fill: rgb(1, 143, 96);
}

polygon,
path {
  fill: white;
}

.sign {
  position: absolute;
  color: white;
  bottom: 10px;
  right: 10px;
  font-size: 10px;
}

a {
  color: white;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

function init() { 
  const catWrapper = document.querySelector('.cat_wrapper')
  const wrapper = document.querySelector('.wrapper')
  const cat = document.querySelector('.cat')
  const head = document.querySelector('.cat_head')
  const legs = document.querySelectorAll('.leg')
  const pos = {
    x: null,
    y: null
  }

  const walk = () =>{
    cat.classList.remove('first_pose')
    legs.forEach(leg=>leg.classList.add('walk'))
  }

  const handleMouseMotion = e =>{
    pos.x = e.clientX
    pos.y = e.clientY
    walk()
  }

  const handleTouchMotion = e =>{
    if (!e.targetTouches) return
    pos.x = e.targetTouches[0].offsetX
    pos.y = e.targetTouches[0].offsetY
    walk()
  }

  const turnRight = () =>{
    cat.style.left = `${pos.x - 90}px`
    cat.classList.remove('face_left')
    cat.classList.add('face_right')
  }

  const turnLeft = () =>{
    cat.style.left = `${pos.x + 10}px`
    cat.classList.remove('face_right')
    cat.classList.add('face_left')
  }

  const decideTurnDirection = () =>{
    cat.getBoundingClientRect().x < pos.x ?
      turnRight()
      :
      turnLeft()
  }

  const headMotion = () =>{
    pos.y > (wrapper.clientHeight - 100) ?
      head.style.top = '-15px'
      :
      head.style.top = '-30px'
  }

  const jump = () =>{
    catWrapper.classList.remove('jump')
    if (pos.y < (wrapper.clientHeight - 250)) {
      setTimeout(()=>{
        catWrapper.classList.add('jump')
      },100)
    } 
  }

  const decideStop = ()=>{
    if (cat.classList.contains('face_right') && pos.x - 90 === cat.offsetLeft ||
        cat.classList.contains('face_left') && pos.x + 10 === cat.offsetLeft) {
      legs.forEach(leg=>leg.classList.remove('walk'))    
    }
  }
  
  setInterval(()=>{
    if (!pos.x || !pos.y) return
    decideTurnDirection()
    headMotion()
    decideStop()
  },100)

  setInterval(()=>{
    if (!pos.x || !pos.y) return
    jump()
  },1000)

  document.addEventListener('mousemove', handleMouseMotion)
  document.addEventListener('mousemove', handleTouchMotion)
}

window.addEventListener('DOMContentLoaded', init)

This Pen is owned by Masahito Leo Takeuchi on CodePen.

See more by @Ma5a on CodePen

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