CSS important declarations

I am trying to create a custom skin, but the plugin is inserting some CSS with !important. how can I disable that?

<style type="text/css">
  div#about-jcarousel_container .jcarousel-skin-krf .jcarousel-container-horizontal { width: 600px !important; }
  div#about-jcarousel_container .jcarousel-skin-krf .jcarousel-clip-horizontal { width: 600px !important; height: 150px !important; }
  div#about-jcarousel_container .jcarousel-skin-krf .jcarousel-next-horizontal { top: 83px !important; }
  div#about-jcarousel_container .jcarousel-skin-krf .jcarousel-prev-horizontal { top: 83px !important; }
  div#about-jcarousel_container .jcarousel-skin-krf .jcarousel-item { width: 150px; height: 150px; }

</style>