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HTML

              
                .container.js-fizz-buzz
              
            
!

CSS

              
                :root
  --colour #A56CC1
  --secondaryColour #ACE7EF
  --fontSizeSmall 0.8rem

body
  padding 2rem
  background-color var(--colour)
  font-family karla
  color #fff
  font-size 1.25em

.container
  --size 6rem
  --borderWidth 2px
  display grid
  grid-auto-rows var(--size)
  grid-template-columns repeat(auto-fill, var(--size))
  max-width calc(var(--size) * 8)
  counter-reset fizzBuzz

.container__item
  display flex
  position relative
  padding 1rem
  justify-content center
  align-items center
  counter-increment fizzBuzz
  
  &:before
    position absolute
    top calc(var(--borderWidth) * -0.5)
    right @top
    bottom @top
    left @top
    border-color var(--secondaryColour)
    border-style solid
    border-width var(--borderWidth)
    content ''
  
  &:after
    position absolute
    left 0.5rem
    top @left
    font-size var(--fontSizeSmall)
    line-height 1
    opacity 0.4
    content counter(fizzBuzz)
              
            
!

JS

              
                // The divisor map function is defined here: https://codepen.io/Ash/pen/mVmqqp.
const fizzBuzz = divisorMap({
  3: '🍹',
  5: '🐝',
  // 13: '💩'
})

const container = document.querySelector('.js-fizz-buzz')
const length = 100

for (let i = 1; i <= length; i ++) {
  container.innerHTML += `<div class='container__item'>${fizzBuzz(i)}</div>`
}
              
            
!
999px

Console