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CSS

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HTML 

              
                .pac-input__wrap
  .pac-input
    input(data-lpignore="true" type='password' value='chomprulz' autocomplete="off")
    a.pac-input__pac
    a.pac-input__ghost
      .pac-input__ghost-eyes
    .pac-input__cloak
!

CSS 

              
                *
  box-sizing border-box

:root
  --bg hsl(211, 97%, 12%)
  --input hsl(0, 0%, 60%)
  --pac hsl(59, 100%, 50%)
  --border hsl(231, 92%, 45%)
  --border--hover hsl(231, 92%, 62%)
  --border--active hsl(231, 92%, 52%)
  --ghost--green hsl(181, 100%, 57%)
  --ghost--pink hsl(332, 98%, 81%)
  --ghost--orange hsl(48, 100%, 50%)
  --ghost--red hsl(12, 100%, 47%)
  --track--dot hsl(0, 0%, 98%)
  --size 30px
  --width 300px
  --height 50px
  --font 24px
  --speed .25s

html
body
  background var(--bg)
  display flex
  align-items center
  justify-content center
  min-height 100vh
  width 100vw
  font-family 'Arial', sans-serif
  overflow hidden

.pac-input
  position relative
  overflow hidden
  border 6px solid var(--border)
  border-radius 8px
  transition border-color 0.1
  
  &__wrap
    border-radius 8px
    box-shadow 0 20px 20px -20px black

  & > input
    border 0
    border-radius 0
    font-size var(--font)
    line-height var(--font)
    padding 6px 45px 6px 12px
    letter-spacing 1px
    width var(--width)
    height var(--height)
    background var(--input)

    &:focus
      outline transparent

  &__cloak
    background-color $var(--input)
    width 100%
    height var(--size)
    position absolute
    top 50%
    left 100%
    transform translate(-24px, -50%)

  &__ghost
    cursor pointer
    height var(--size)
    width 100%
    position absolute
    right 105%
    top 50%
    width var(--size)
    border-radius 100% 100% 0 0
    position absolute
    z-index 1
    transform translate(0, -50%)
    clip-path polygon(15% 100%, 0 85%, 0 0, 100% 0, 100% 85%, 85% 100%, 66% 85%, 50% 100%, 30% 85%)
    -webkit-clip-path polygon(15% 100%, 0 85%, 0 0, 100% 0, 100% 85%, 85% 100%, 66% 85%, 50% 100%, 30% 85%)

    &-eyes
      height 6px
      width 20px
      position absolute
      top 8px
      left 5px


      &:before
      &:after
        border-radius 100%
        content ''
        height 6px
        width 6px
        background radial-gradient(circle at 30% 60%, blue 0, blue 25%, white 25%, white 100%)
        position absolute

      &:after
        left 8px

  &__pac
    cursor pointer
    position absolute
    top 50%
    right 10px
    height var(--size)
    width var(--size)
    transform translate(0, -50%)
    z-index 1

    &--chomping
      &:before
        animation-name chomp--1
      &:after
        animation-name chomp--2


    &:before
    &:after
      content ''
      position absolute
      left 0
      border-radius 100%
      border calc(var(--size) / 2) solid var(--pac)
      transform-origin center center
      animation-duration var(--speed)
      animation-timing-function linear
      animation-iteration-count infinite

    &:before
      border-left-color transparent
      border-bottom-color transparent

    &:after
      border-top-color transparent
      border-right-color transparent
      transform rotate(-90deg)

@keyframes chomp--1
  0%, 100%
    transform rotate(0deg)
  50%
    transform rotate(-45deg)

@keyframes chomp--2
  0%, 100%
    transform rotate(-90deg)
  50%
    transform rotate(-45deg)
!

JS 

              
                const {
  gsap: {
    timeline,
    set,
    utils: { random },
  },
} = window

const AUDIO = {
  CLICK: new Audio('https://assets.codepen.io/605876/click.mp3'),
  IN: new Audio('https://assets.codepen.io/605876/pac-in.mp3'),
  OUT: new Audio('https://assets.codepen.io/605876/pac-out.mp3'),
}

const CONTAINER = document.querySelector('.pac-input')
const PAC = CONTAINER.querySelector('.pac-input__pac')
const GHOST = CONTAINER.querySelector('.pac-input__ghost')
const EYES = GHOST.querySelector('.pac-input__ghost-eyes')
const INPUT = CONTAINER.querySelector('input')
const CLOAK = CONTAINER.querySelector('.pac-input__cloak')

const COLORS = {
  INPUT: 'hsl(0, 0%, 60%)',
  BG: 'hsl(0, 0%, 0%)',
  GHOST: ['orange', 'green', 'pink', 'red'],
}
const DURATIONS = {
  ENV: 0.15,
  CHOMP: 1,
  GHOST: 1,
  EYES: 0.5,
}

const BLINK = () => {
  const delay = random(2, 6)
  timeline().to(EYES, {
    delay,
    onComplete: () => BLINK(),
    scaleY: 0.1,
    repeat: 3,
    yoyo: true,
    duration: 0.05,
  })
}
BLINK()

const hidePassword = () => {
  timeline({
    onStart: () => AUDIO.CLICK.play(),
    onComplete: () => {
      AUDIO.OUT.pause()
      AUDIO.OUT.currentTime = 0
    },
  })
    .to(GHOST, {
      duration: DURATIONS.EYES,
      right: '105%',
      ease: 'none',
      onStart: () => {
        AUDIO.OUT.play()
        set(GHOST, { backgroundColor: COLORS.INPUT })
      },
    })
    .to(
      CLOAK,
      {
        duration: DURATIONS.EYES,
        onComplete: () => {
          set(PAC, { right: 10, scale: 0 })
          set(INPUT, { attr: { type: 'password' } })
        },
        left: -5,
        ease: 'none',
      },
      0
    )
    .to(CLOAK, DURATIONS.ENV, {
      duration: DURATIONS.ENV,
      opacity: 0,
      onComplete: () => {
        set(CLOAK, { left: '100%', opacity: 1 })
      },
    })
    .to(
      PAC,
      {
        duration: DURATIONS.ENV,
        scale: 1,
      },
      DURATIONS.EYES
    )
}

const showPassword = () => {
  timeline({
    onStart: () => AUDIO.CLICK.play(),
    onComplete: () => {
      AUDIO.IN.pause()
      AUDIO.IN.currentTime = 0
    },
  })
    .to(INPUT, {
      duration: DURATIONS.ENV,
      onStart: () => {
        set(GHOST, {
          backgroundColor: `var(--ghost--${
            COLORS.GHOST[Math.floor(Math.random() * COLORS.GHOST.length)]
          })`,
        })
      },
      letterSpacing: 15,
      backgroundColor: COLORS.BG,
      color: 'hsl(0, 0, 98%)',
    })
    .to(
      CLOAK,
      {
        duration: DURATIONS.ENV,
        backgroundColor: COLORS.BG,
      },
      0
    )
    .to(PAC, DURATIONS.CHOMP, {
      duration: DURATIONS.CHOMP,
      right: '105%',
      ease: 'none',
      onStart: () => {
        AUDIO.IN.play()
        PAC.classList.add('pac-input__pac--chomping')
      },
      onComplete: () => {
        PAC.classList.remove('pac-input__pac--chomping')
        set(INPUT, { attr: { type: 'text' } })
      },
    })
    .to(
      CLOAK,
      {
        duration: DURATIONS.CHOMP,
        left: -5,
        ease: 'none',
      },
      '<'
    )
    .to(GHOST, {
      duration: DURATIONS.GHOST,
      right: 10,
      ease: 'none',
    })

    .to(
      CLOAK,
      {
        duration: DURATIONS.GHOST,
        left: '100%',
        ease: 'none',
      },
      '<'
    )
    .to(INPUT, {
      duration: DURATIONS.ENV,
      letterSpacing: 1,
      backgroundColor: COLORS.INPUT,
      color: 'black',
    })
    .to(
      CLOAK,
      {
        duration: DURATIONS.ENV,
        backgroundColor: COLORS.INPUT,
      },
      '<'
    )
}

PAC.addEventListener('click', showPassword)
GHOST.addEventListener('click', hidePassword)
!
999px

Console