Ошибки по валидатору - Вопросы по CSS

<li id="item-206" class="accordeonck item-206 parent level1 " data-level="1"><img src="/modules/mod_accordeonck/assets/plus.png" class="toggler toggler_1" align="right"/><a href="/index.php/shirokoformatnaya-pechat" >ШИРОКОФОРМАТНАЯ ПЕЧАТЬ</a><ul class="content_1" style="display:none;"><li id="item-207" class="accordeonck item-207 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/pechat-na-bannere" >Печать на баннере</a></li><li id="item-208" class="accordeonck item-208 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/pechat-na-setke" >Печать на сетке</a></li><li id="item-210" class="accordeonck item-210 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/pechat-na-bumage" >Печать на бумаге</a></li><li id="item-211" class="accordeonck item-211 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/pechat-na-kholste" >Печать на холсте</a></li><li id="item-209" class="accordeonck item-209 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/pechat-na-plenke" >Печать на пленке</a></li><li id="item-212" class="accordeonck item-212 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/pechat-na-tkani" >Печать на ткани</a></li><li id="item-213" class="accordeonck item-213 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/mobilnye-stendy" >Мобильные стенды</a></li><li id="item-214" class="accordeonck item-214 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/vystavochnye-planshety" >Выставочные планшеты</a></li><li id="item-215" class="accordeonck item-215 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/naklejki" >Наклейки</a></li><li id="item-216" class="accordeonck item-216 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/plakaty" >Плакаты</a></li><li id="item-217" class="accordeonck item-217 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/postery" >Постеры</a></li><li id="item-218" class="accordeonck item-218 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/konstruktsii-iz-plastika-i-penokartona" >Конструкции из пластика и пенокартона</a></li><li id="item-219" class="accordeonck item-219 level2 " data-level="2"><a href="/index.php/shirokoformatnaya-pechat/rastyazhki-k-prazdnikam" >Растяжки к праздникам</a></li></ul></li><li id="item-220" class="accordeonck item-220 parent level1 " data-level="1"><img src="/modules/mod_accordeonck/assets/plus.png" class="toggler toggler_1" align="right"/><a href="/index.php/ofsetnaya-pechat" >ОФСЕТНАЯ ПЕЧАТЬ</a><ul class="content_1" style="display:none;"><li id="item-221" class="accordeonck item-221 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/buklety" >Буклеты</a></li><li id="item-222" class="accordeonck item-222 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/broshyury" >Брошюры</a></li><li id="item-223" class="accordeonck item-223 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/zhurnaly" >Журналы</a></li><li id="item-224" class="accordeonck item-224 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/gazety" >Газеты</a></li><li id="item-225" class="accordeonck item-225 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/katalogi" >Каталоги</a></li><li id="item-226" class="accordeonck item-226 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/bloknoty" >Блокноты</a></li><li id="item-227" class="accordeonck item-227 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/listovki" >Листовки</a></li><li id="item-228" class="accordeonck item-228 level2 " data-level="2"><a href="/index.php/ofsetnaya-pechat/papki" >Папки</a></li></ul></li><li id="item-229" class="accordeonck item-229 parent level1 " data-level="1"><img src="/modules/mod_accordeonck/assets/plus.png" class="toggler toggler_1" align="right"/><a href="/index.php/tsifrovaya-pechat" >ЦИФРОВАЯ ПЕЧАТЬ</a><ul class="content_1" style="display:none;"><li id="item-233" class="accordeonck item-233 level2 " data-level="2"><a href="/index.php/tsifrovaya-pechat/priglasheniya" >Приглашения</a></li><li id="item-231" class="accordeonck item-231 level2 " data-level="2"><a href="/index.php/tsifrovaya-pechat/vizitki" >Визитки</a></li><li id="item-236" class="accordeonck item-236 level2 " data-level="2"><a href="/index.php/tsifrovaya-pechat/blanki" >Бланки</a></li><li id="item-238" class="accordeonck item-238 level2 " data-level="2"><a href="/index.php/tsifrovaya-pechat/gramoty" >Грамоты</a></li><li id="item-239" class="accordeonck item-239 level2 " data-level="2"><a href="/index.php/tsifrovaya-pechat/konverty" >Конверты</a></li></ul></li><li id="item-240" class="accordeonck item-240 parent level1 " data-level="1"><img src="/modules/mod_accordeonck/assets/plus.png" class="toggler toggler_1" align="right"/><a href="/index.php/suvenirnaya-produktsiya" >СУВЕНИРНАЯ ПРОДУКЦИЯ</a><ul class="content_1" style="display:none;"><li id="item-241" class="accordeonck item-241 level2 " data-level="2"><a href="/index.php/suvenirnaya-produktsiya/ezhednevniki-planningi-bloknoty" >Ежедневники, планнинги, блокноты</a></li><li id="item-242" class="accordeonck item-242 level2 " data-level="2"><a href="/index.php/suvenirnaya-produktsiya/pakety-bumazhnye-pvd" >Пакеты (бумажные, ПВД)</a></li><li id="item-243" class="accordeonck item-243 level2 " data-level="2"><a href="/index.php/suvenirnaya-produktsiya/promoodezhda-kepki-futbolki" >Промоодежда (кепки, футболки)</a></li><li id="item-244" class="accordeonck item-244 level2 " data-level="2"><a href="/index.php/suvenirnaya-produktsiya/kalendari" >Календари</a></li><li id="item-245" class="accordeonck item-245 level2 " data-level="2"><a href="/index.php/suvenirnaya-produktsiya/sumki-i-ryukzaki" >Сумки и рюкзаки</a></li></ul></li><li id="item-246" class="accordeonck item-246 level1 " data-level="1"><a href="/index.php/dizajn-i-verstka" >ДИЗАЙН И ВЕРСТКА</a></li><li id="item-256" class="accordeonck item-256 level1 " data-level="1"><a href="javascript:void(0);"><span class="separator">ОФОРМЛЕНИЕ УЧРЕЖДЕНИЙ</span></a></li></ul></div>
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