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HTML 

              
                form(onsubmit=`return false;`)
  label(for='password') Password
  input#password(type='password', pattern='password123', placeholder="Enter your password", required, title="Wasn't your password \"password123\"? 🤫")
  input#login(type='checkbox')
  label.login-button(for='login')
    span Enter
    svg
      path(d="M10,17V14H3V10H10V7L15,12L10,17M7,2H17A2,2 0 0,1 19,4V20A2,2 0 0,1 17,22H7A2,2 0 0,1 5,20V16H7V20H17V4H7V8H5V4A2,2 0 0,1 7,2Z")
  .padlock
    .padlock__hook
      .padlock__hook-body
      .padlock__hook-body
    .padlock__body
      .padlock__face
        .padlock__eye.padlock__eye--left
        .padlock__eye.padlock__eye--right
        .padlock__mouth.padlock__mouth--one
        .padlock__mouth.padlock__mouth--two
        .padlock__mouth.padlock__mouth--three
  .app
    h1 You logged in! 🎉
    button.logout-button(type='reset') Logout
  span.logout-message You have logged out.
!

CSS 

              
                *
*:after
*:before
  box-sizing border-box

:root
  --transition 0.2
  --bg-one hsl(280, 60%, 5%)
  --bg-two hsl(280, 90%, 15%)
  --stop 40
  --angle 45
  --border-width 5
  --padlock-size 300
  --border-radius 6

body
  align-items center
  display flex
  justify-content center
  min-height 100vh
  font-family sans-serif
  background linear-gradient(calc(var(--angle) * 1deg), var(--bg-one) calc(var(--stop) * 1%), var(--bg-two) calc(var(--stop) * 1%))

form
  display grid
  grid-template-columns auto
  grid-gap 0.5rem 1rem
  justify-items center
  position relative

[type='password']
  padding 12px 20px
  font-size 1rem
  border-width calc(var(--border-width) * 1px)
  border-style solid
  border-color var(--accent)
  border-radius calc(var(--border-radius) * 1px)
  text-align center
  outline transparent
  width 100%
  transition border-color calc(var(--transition, 0.2) * 1s) ease

  &:valid
    --accent hsla(100, 100%, 50%, 1)

  &:invalid
    --accent hsla(10, 100%, 50%, 0.5)

  &:placeholder-shown
    --accent hsl(0, 0%, 100%)

.app
  height 100vh
  width 100vw
  position fixed
  top 0
  left 0
  display flex
  align-items center
  flex-direction column
  justify-content center
  background hsla(0, 0%, 95%, 1)
  transform scale(var(--scale))
  transition transform calc(var(--transition, 0.2) * 1s) ease

[for='password']
#login
  height 0
  width 0
  transform scale(0)
  position absolute

.logout-button
  --size 52
  --lightness 45
  height calc(var(--size) * 1px)
  padding 12px 20px
  text-transform uppercase
  font-weight bold
  color #fff
  background 'hsl(10, 80%, %s)' % calc(var(--lightness) * 1%)
  border 0
  border-radius calc(var(--border-radius) * 1px)
  cursor pointer

  &:hover
    --lightness 30

  &:active
    --lightness 20

.login-button
  --size 52
  --lightness 45
  align-items center
  background 'hsl(100, 80%, %s)' % calc(var(--lightness) * 1%)
  border-radius calc(var(--border-radius) * 1px)
  cursor pointer
  display flex
  height calc(var(--size) * 1px)
  justify-content center
  padding 12px 20px
  text-transform uppercase
  font-weight bold
  color #fff
  width 100%
  transition background calc(var(--transition, 0.2) * 1s) ease

  svg
    transform translate(50%, 0)

  *
    cursor pointer

  &:hover
    --lightness 30

  &:active
    --lightness 20

  svg

    height 24px
    width 24px
    path
      fill white

.padlock
  --hue 65
  --color hsl(50, 100%, 50%)
  --color-one hsl(38, 100%, 50%)
  --color-two hsl(0, 0%, 100%)
  height calc(var(--padlock-size) * 1px)
  width calc(var(--padlock-size) * 1px)
  grid-row 1
  position relative

  &__body
    border 8px solid black
    border-radius 20px
    position absolute
    bottom 10%
    width 66%
    height 46%
    left 50%
    transform translate(-50%, 0)
    background var(--color)
    box-shadow -30px 0 0px 0px var(--color-one) inset,
      10px 0 0px 0px var(--color-two) inset

  &__face
    height 25%
    width 40%
    position absolute
    top 50%
    left 50%
    transform translate(-50%, 0)

  &__eye
    position absolute
    height 15px
    width 15px
    background hsl(0, 0%, 0%)
    top 0
    border-radius 50%
    animation blink 4s infinite linear

    &:after
      content ''
      height 25%
      width 25%
      background hsl(0, 0%, 100%)
      border-radius 50%
      position absolute
      top 50%
      left 50%
      transform translate(-100%, -100%)

    &--left
      left 0

    &--right
      right 0

    @keyframes blink
      0%, 24%, 27%, 100%
        transform scaleY(1)
      25%, 26%
        transform scaleY(0)

  &__mouth
    width 25%
    height 10px
    position absolute
    bottom 0
    left 50%
    transform translate(-50%, 0)

    &--one
      background black
      height 5px
      width 40%
      left 45%
      bottom 25%
      display block

    &--two
    &--three
      height 24px
      width 20px
      border-radius 50%
      bottom 24%
      $clip = inset(64% 0 0 0)
      background transparent
      -webkit-clip-path $clip
      clip-path $clip
      display none
      overflow hidden

      &:before
        content ''
        height 100%
        width 100%
        position absolute
        top 0
        left 0
        border-radius 50%
        border 4px solid hsl(0, 0%, 0%)

    &--three
      background hsl(0, 0%, 0%)

      &:after
        content ''
        position absolute
        height 6px
        width 10px
        border-radius 50%
        bottom -2px
        left 40%
        background red

  &__hook
    --delay 1
    --clip 40
    width 50%
    height 90%
    position absolute
    left 50%
    top 50%
    transform translate(-50%, calc(var(--pos, 40) * -1%))
    $clip = inset(0 0 30% 0)
    -webkit-clip-path $clip
    clip-path $clip
    transition transform calc(var(--transition, 0.2) * 1s) calc(((var(--transition, 0.2) * 1.5) * var(--delay, 0)) * 1s) cubic-bezier(.78, .16, .64, 1.8)

    &:after
      content ''
      position absolute
      top 50%
      left 50%
      width calc(100% - 16px)
      height calc(100% - 16px)
      border-radius 50% / 40%
      transform translate(-50%, -50%)
      box-shadow 5px 0 0 0 hsl(0, 0%, 100%) inset,
        -10px 0 0 0 hsl(0, 0%, 40%) inset
      $clip = polygon(0 0, 100% 0, 100% calc(var(--clip) * 1%), 50% calc(var(--clip) * 1%), 50% 100%, 0 100%)
      -webkit-clip-path $clip
      clip-path $clip

    & > div
      position absolute
      top 50%
      left 50%
      transform translate(-50%, -50%)

    & > div:nth-of-type(1)
      width 100%
      height 100%
      border 36px solid #000
      border-radius 50% / 40%
      $clip = polygon(0 0, 100% 0, 100% calc(calc(var(--clip) * 1%) + 8px), 50% calc(calc(var(--clip) * 1%) + 8px), 50% 100%, 0 100%)
      -webkit-clip-path $clip
      clip-path $clip

    & > div:nth-of-type(2)
      width calc(100% - 16px)
      height calc(100% - 16px)
      border 20px solid hsl(0, 0%, 75%)
      border-radius 50% / 40%
      $clip = polygon(0 0, 100% 0, 100% calc(var(--clip) * 1%), 50% calc(var(--clip) * 1%), 50% 100%, 0 100%)
      -webkit-clip-path $clip
      clip-path $clip

.logout-message
  display block
  width 100%
  border-radius calc(var(--border-radius) * 1px)
  padding 1rem
  background white
  text-align center
  font-weight bold

// Functionality
#login:checked ~ .app
  --scale 1

[type='password']:valid
  & ~ #login
  & ~ [for='login']
    visibility visible

    &:hover ~ .padlock
      .padlock__mouth--one
      .padlock__mouth--two
        display none
      .padlock__mouth--three
        display block
  & ~ .padlock
    .padlock__mouth--one
      display none
    .padlock__mouth--two
      display block

    .padlock__hook
      --pos 60
      --delay 0

[type='password']:placeholder-shown
  & ~ .app
    transition transform 0s 0s ease

.app:focus-within ~ .logout-message
    visibility visible
    grid-row 3

#login
[for='login']
.logout-message
  visibility hidden

.app
  --scale 0
!

JS 

              
                // No JavaScript was harmed in this process.
!
999px

Console