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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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