.otstup {
margin: 20px 0px 20px 0px;
}

a.blog_guest {
  display:block;
  width:200px;
  height:70px;
  background:url('blog_guest_01.png') left top;
}

a.blog_guest:hover {
  background-position:left 70px;
}

a.blog_forum {
  display:block;
  width:200px;
  height:70px;
  background:url('blog_forum_01.png') left top; }

a.blog_forum:hover {
  background-position:left 70px;
}
   
a.blog_blog {
  display:block;
  width:200px;
  height:70px;
  background:url('blog_blog_01.png') left top;
}

a.blog_blog:hover {
  background-position:left 70px;
}