BootstrapComponent.component

<apex:component>
  <apex:stylesheet value="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" />
  <apex:includeScript value="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js" />
  <apex:includeScript value="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js" />

  <style type="text/css">
  #sidebarDiv {
    background: crimson;
  }
  </style>

  <script type="text/javascript">
  alert("Hello world from the component!");
  </script>
</apex:component>