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HTML

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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                .calendar
  .base.top
    .year-side
    .month-side
    .holes
      .hole
      .hole
      .hole
      .hole
      .hole
      .hole
  .base.bottom
    - var n = 1;
    .days
      each day in ['SUN', 'MON', 'TUE', 'WED', 'THU', 'FRI', 'SAT']
        .weekday= day
      .old 30
      while n < 32
        div= n++
      .old 1
      .old 2
      .old 3
    .holes
      .hole
      .hole
      .hole
      .hole
      .hole
      .hole
  .rings
    .ring
    .ring
    .ring
    .ring
    .ring
    .ring
!

CSS 

              
                $color-background: #669BBC
$color-primary: #29335C
$color-secondary: #F3A712
$color-shadow: rgba(0, 0, 0, 0.27)
$color-rings: #fff

=size($width, $height)
  width: percentage($width / 100)
  height: percentage($height / 100)

=position($top, $left)
  position: absolute
  top: percentage($top / 100)
  left: percentage($left / 100)

body
  padding-top: 5vh
  background-color: $color-background

.calendar
  position: relative
  margin: auto
  width: 70vw
  height: 70vw

.base
  +size(70, 45)
  border-radius: 2vw
  box-shadow: 0.2vw 0.2vw 1vw 0 $color-shadow
  overflow: hidden

  &.top
    +position(5, 15)
    background-color: $color-primary

    .holes
      +position(88, 4)

  &.bottom
    +position(51, 15)
    background-color: #fff

    .holes
      +position(4, 4)

    &::before
      content: ' '
      display: block
      +size(100, 28)
      background-color: $color-primary

.holes
  +size(45 / 0.7 * 2, 100 * 2)

  .hole
    background-color: $color-background
    +size(4, 4)
    border-radius: 50%
    display: inline-block
    margin-left: 3.8vw
    box-shadow: inset 0.2vw 0.2vw 1vw 0 $color-shadow

.rings
  +size(70, 10)
  +position(45.5, 17.3)

  .ring
    +size(3.5, 100)
    display: inline-block
    background-color: lighten($color-rings, 10%)
    margin-left: 4.6vw
    border-radius: 70% / 10%
    box-shadow: 0.3vw 0 0.5vw -0.2vw $color-shadow

.year-side
  background-color: $color-secondary
  +size(20, 100)
  +position(0, 0)

  &::after
    content: '2017'
    display: block
    color: $color-primary
    font-family: Roboto, sans-serif
    font-size: 7vw
    transform: rotate(-90deg)
    +position(35, -30)

.month-side
  +size(80, 100)
  +position(0, 20)

  &::after
    content: 'MAY'
    display: block
    color: $color-secondary
    font-family: Roboto, sans-serif
    font-size: 8vw
    +position(35, 25)

.days
  +size(90, 75)
  +position(15, 5)
  display: grid
  grid-template: repeat(6, 1fr) / repeat(7, 1fr)
  grid-gap: 0.2vw

  &>div
    text-align: center
    padding-top: 20%
    font-family: Roboto, sans-serif
    font-size: 1.8vw
    color: $color-primary

    &.old
      color: #999

    &.weekday
      font-weight: bold
      color: $color-secondary
!

JS 

              
                // https://www.neckersbox.eu
!
999px

Console