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HTML

              
                h1 progressbar test
#bar
  div
p
  input(type='button' value='-' id='minus')
  input(type='button' value='+' id='plus')
              
            
!

CSS

              
                body
  background: #0e0f10
h1
  margin: 80px 0 15px
  padding: 0
  text-align: center
  letter-spacing: 3px
  font-weight: 300
  font-family: 'Open sans condensed', sans-serif
  font-size: 46px
  text-transform: uppercase
  color: #a0a0a0
#bar
  background-color: #606060
  width: 400px
  height: 24px
  margin: 0 auto
  border-radius: 50px
  > div
    max-width: 394px
    width: 100%
    height: 16px
    background: #52b0e3
    border-radius: 50px
    position: relative
    top: 4px
    left: 3px
    transition: width 500ms
p
  text-align: center
              
            
!

JS

              
                var jumpsize=10,// %
  body = $('body')
  container = $('#bar'),
  bar = container.children('div'),

topcnt = function(px){
  return 100 * px / container.width()
},
set = function(pcnt){
  bar.css({ width : pcnt + '%' })
};

body.on('click', '#minus', function(){
  set(topcnt(bar.width()) - jumpsize)
}).on('click', '#plus', function(){
  set(topcnt(bar.width()) + jumpsize)
})

set(40)
              
            
!
999px

Console