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HTML 

              
                body
  h1 CSS Switches
  .container
    .switch.switch--horizontal
      input#radio-a(type="radio", name="first-switch", checked)
      label(for="radio-a") Off
      input#radio-b(type="radio", name="first-switch")
      label(for="radio-b") On
      span.toggle-outside
        span.toggle-inside
    
    .switch.switch--vertical
      input#radio-c(type="radio", name="second-switch", checked)
      label(for="radio-c") Off
      input#radio-d(type="radio", name="second-switch")
      label(for="radio-d") On
      span.toggle-outside
        span.toggle-inside

    .switch.switch--horizontal.switch--no-label
      input#radio-e(type="radio", name="third-switch", checked)
      label(for="radio-e") Off
      input#radio-f(type="radio", name="third-switch")
      label(for="radio-f") On
      span.toggle-outside
        span.toggle-inside

    .switch.switch--vertical.switch--no-label
      input#radio-e(type="radio", name="fourth-switch", checked)
      label(for="radio-g") Off
      input#radio-f(type="radio", name="fourth-switch")
      label(for="radio-h") On
      span.toggle-outside
        span.toggle-inside

    .switch.switch--horizontal.switch--expanding-inner
      input#radio-i(type="radio", name="fifth-switch", checked)
      label(for="radio-i") Off
      input#radio-j(type="radio", name="fifth-switch")
      label(for="radio-j") On
      span.toggle-outside
        span.toggle-inside
    
    .switch.switch--vertical.switch--expanding-inner
      input#radio-k(type="radio", name="sixth-switch", checked)
      label(for="radio-k") Off
      input#radio-l(type="radio", name="sixth-switch")
      label(for="radio-l") On
      span.toggle-outside
        span.toggle-inside

    .switch.switch--horizontal.switch--no-label.switch--expanding-inner
      input#radio-m(type="radio", name="seventh-switch", checked)
      label(for="radio-m") Off
      input#radio-n(type="radio", name="seventh-switch")
      label(for="radio-n") On
      span.toggle-outside
        span.toggle-inside

    .switch.switch--vertical.switch--no-label.switch--expanding-inner
      input#radio-o(type="radio", name="eighth-switch", checked)
      label(for="radio-o") Off
      input#radio-p(type="radio", name="eighth-switch")
      label(for="radio-p") On
      span.toggle-outside
        span.toggle-inside
!

CSS 

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

body
  font-family "Open Sans"
  font-weight 300
  margin 2rem
  background #4a4a4a
  -webkit-backface-visibility hidden

h1
  text-align center
  color white
  font-weight 300
  margin-bottom 4rem

.container
  width 80%
  margin 0 auto

.switch
  margin: 4rem auto

/* main styles */
.switch
  width 24rem
  position relative
  & input
    position absolute
    top 0
    z-index 2
    opacity 0
    cursor pointer
    &:checked
      z-index 1
      & + label
        opacity 1
        cursor default
    &:not(:checked) + label:hover
      opacity .5
  & label
    color white
    opacity .33
    transition opacity .25s ease
    cursor pointer
  & .toggle-outside
    height 100%
    border-radius 2rem
    padding .25rem
    overflow hidden
    transition .25s ease all
  & .toggle-inside
    border-radius 5rem
    background #4a4a4a
    position absolute
    transition .25s ease all

.switch--horizontal
  width 18rem
  height 3rem
  margin 0 auto
  font-size 0
  margin-bottom 1rem
  & input
    height 3rem
    width 6rem
    left 6rem
    margin 0
  & label
    font-size 1.5rem
    line-height 3rem
    display inline-block
    width 6rem
    height 100%
    margin 0
    text-align center
  & label:last-of-type 
    margin-left 6rem
  & .toggle-outside
    background white
    position absolute
    width 6rem
    left 6rem
  & .toggle-inside 
    height 2.5rem
    width 2.5rem
  & input:checked ~ .toggle-outside .toggle-inside
    left .25rem
  & input ~ input:checked ~ .toggle-outside .toggle-inside
    left 3.25rem

.switch--vertical
  width 12rem
  height 6rem
  & input
    height 100%
    width 3rem
    right 0
    margin 0
  & label
    font-size 1.5rem
    line-height 3rem
    display block
    width 8rem
    height 50%
    margin 0
    text-align center
  & .toggle-outside
    background white
    position absolute
    width 3rem
    height 100%
    right 0
    top 0
  & .toggle-inside 
    height 2.5rem
    left .25rem
    top .25rem
    width 2.5rem
  & input:checked ~ .toggle-outside .toggle-inside
    top .25rem
  & input ~ input:checked ~ .toggle-outside .toggle-inside
    top 3.25rem

.switch--no-label  
  & label
    width 0
    height 0
    visibility hidden
    overflow hidden
  & input:checked ~ .toggle-outside .toggle-inside
    background rgba(0,0,0,.2)
    border 1px solid rgba(0,0,0,.2)
  & input ~ input:checked ~ .toggle-outside
    // background #2c3e50
    background #fff
  & input ~ input:checked ~ .toggle-outside .toggle-inside
    background #2ecc71
  &.switch--vertical
    width 3rem
  &.switch--horizontal
    width 6rem
    & input
    & .toggle-outside
      left 0


.switch--expanding-inner
  & input:checked + label:hover ~ .toggle-outside .toggle-inside
      height 2.5rem
      width 2.5rem
  &.switch--horizontal
    & input:hover ~ .toggle-outside .toggle-inside
      width 3.5rem
    & input:hover ~ input:checked ~ .toggle-outside .toggle-inside
      left 2.25rem
  &.switch--vertical
    & input:hover ~ .toggle-outside .toggle-inside
      height 3.5rem
    & input:hover ~ input:checked ~ .toggle-outside .toggle-inside
      top 2.25rem

/* mixin */
switch(w = 6em, h = 3em, padding = .25em, outer-bg = #fff, inner-bg = #4a4a4a )
  position relative
  & input
    position absolute
    top 0
    z-index 2
    opacity 0
    cursor pointer
    &:checked
      z-index 1
      & + label
        opacity 1
        cursor default
    &:not(:checked) + label:hover
      opacity .5
  & label
    color white
    opacity .33
    transition opacity .25s ease
    cursor pointer
  & .toggle-outside
    height 100%
    border-radius 2rem
    padding .25rem
    overflow hidden
    transition .25s ease all
  & .toggle-inside
    border-radius 5rem
    background inner-bg
    position absolute
    transition .25s ease all
  &.switch--horizontal
    width 3 * w
    height h
    margin 0 auto
    font-size 0
    margin-bottom 1rem
    & input
      height h
      width w
      left w
      margin 0
    & label
      font-size h / 2
      line-height h
      display inline-block
      width w
      height 100%
      margin 0
      text-align center
    & label:last-of-type 
      margin-left 6rem
    & .toggle-outside
      background white
      position absolute
      width w
      left w
    & .toggle-inside 
      height (h - 2 * padding)
      width (h - 2 * padding)
    & input:checked ~ .toggle-outside .toggle-inside
      left padding
    & input ~ input:checked ~ .toggle-outside .toggle-inside
      left (w - h - 3 * padding)
  &.switch--vertical
    width 2 * w
    height 2 * h
    & input
      height 100%
      width w
      right 0
      margin 0
    & label
      font-size h / 2
      line-height h
      display block
      width w * 1.5
      height 50%
      margin 0
      text-align center
    & .toggle-outside
      background white
      position absolute
      width w / 2
      height 100%
      right 0
      top 0
    & .toggle-inside 
      height h - ( 2 * padding )
      width h - ( 2 * padding )
      left padding
      top padding
    & input:checked ~ .toggle-outside .toggle-inside
      top padding
    & input ~ input:checked ~ .toggle-outside .toggle-inside
      top ( ( 2 * h ) - ( h - 3 * padding ) )
!

JS 

              
                # Idk why the expanding ones are broken now, they worked fine a few months ago
!
999px

Console