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HTML

              
                //Inspiration: https://cdpn.io/YjZVdL

a.btn.btn-glow(href='#')
  span Glow Button
              
            
!

CSS

              
                body
    font-family: 'Avenir', sans-serif
    -webkit-text-size-adjust: 100%
    -webkit-font-smoothing: antialiased

.btn
    &.btn-glow
        position: absolute
        top: calc(50% - 20px)
        left: calc(50% - 120px)
        display: inline-block
        padding: 12px 32px
        min-width: 240px
        text-decoration: none
        overflow: hidden
        font-weight: 700
        font-size: 18px
        background: #6D48E5
        border: 0
        color: white
        border-radius: 5px
        box-shadow: 0 6px 12px -2px rgba(#223254,.15)
        span:not(.glow)
            position: relative
            z-index: 1
        &:hover
            color: white
        &:focus
            outline: none
            box-shadow: 0 4px 12px -2px rgba(#223254,.2)
        &:active
            transform: translateY(1px)

.glow
    height: 160px
    width: 160px
    background: radial-gradient(circle closest-side, lighten(#6D48E5, 10%), transparent)
    position: absolute
    border-radius: 100%
    top: -80px
    left: -80px
              
            
!

JS

              
                $glow = $('.btn-glow')

drawGlow = (e) ->
  $t = $(this)
  x = e.pageX - ($t.offset().left)
  y = e.pageY - ($t.offset().top)
  $t.find('.glow').css
    'transform': 'translate(' + x + 'px,' + y + 'px)'

removeGlow = ->
  $('.glow').remove()

addGlow = ->
  $glow.append '<span class="glow"/>'

$glow.on
  'mouseenter': addGlow
  'mousemove': drawGlow
  'mouseleave': removeGlow
              
            
!
999px

Console