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CSS Base

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              <ul class="foo">

<div class="btn-set">
  <button id="toggle">Collaspe</button>
  <button id="reset">Reset</button>
              .foo {
  margin: 10px auto;
  padding: 4px;
  border: 4px solid green;

.foo:after {
    content: "";
    display: table;
    clear: both;

.foo li {
  padding: 2px;
  border: 1px solid #555;
  border-right: 0;
  width: 50px;
  line-height: 50px;
  list-style-type: none;
  float: left;
  text-align: center;

.foo li:last-child {border-right: 1px solid;}

.btn-set {text-align: center;}
   * Quick and dirty container element collaspe without using
   * inline-block, so margin auto can be used to center the parent.
   * @param string A css selector containing one or more child elements.

  function collaspe(elem){
    var last_item = $(elem).find('li:last-child');
    var bar = parseFloat( $(elem).css('borderLeftWidth')) + parseFloat( $(elem).css('paddingRight'));
    var left_edge = ((last_item).offset().left + $(last_item).outerWidth()) - $(elem).offset().left - bar;


  // Setup interactive events.
  $('#toggle').on( 'click', function(){
  $('#reset').on( 'click', function(){
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