.month_list, .content .month_list, #content .month_list {
    float: left;
    width: 60px;
    border-right: 1px solid #eee;
    margin-right: 20px;
}
  .month_list ul {
    position: relative;
  }
  .month_list .selected ul {
    border: none;
    overflow: hidden;
  }