Redmine

  var leftScrollButton = document.createElement('button');

  leftScrollButton.classList = 'tab-left disabled';

  leftScrollButton.setAttribute('type','button');

  leftScrollButton.onclick = function() { moveTabLeft(this); };

  var rightScrollButton = document.createElement('button');

  rightScrollButton.classList = 'tab-right';

  rightScrollButton.setAttribute('type','button');

  rightScrollButton.onclick = function() { moveTabRight(this); };

  var scrollButtons = document.createElement('div');

  scrollButtons.classList = 'tabs-buttons';

  scrollButtons.appendChild(leftScrollButton);

  scrollButtons.appendChild(rightScrollButton);

  this.tabsBlock.appendChild(scrollButtons);

#content .jstTabs.tabs div.tabs-buttons {

    background-color: #f7f7f7;

    height: 24px;

    width: 50px;

    border-bottom: 1px solid #ccc;

}