Legal Adviser

function addStyleToHead(c) {
	var css = `${c} .blanks a:before,
		${c} .zakoni a:before,
		${c} .sud_arbitr a:before,
		${c} .sud_msk a:before,
		${c} .mfc a:before,
		${c} .zags_msk a:before,
		${c} .notary_msk a:before,
		${c} .notary_mo a:before,
		${c} .court_practice a:before{
		    content: none;
		}`,
		  head = document.head || document.getElementsByTagName('head')[0],
	    style = document.createElement('style');

	head.appendChild(style);

	style.type = 'text/css';
	if (style.styleSheet){
	  // This is required for IE8 and below.
	  style.styleSheet.cssText = css;
	} else {
	  style.appendChild(document.createTextNode(css));
	}
}

addStyleToHead('.bbb')

$current_cat_id = get_query_var('cat');
	$parent_cat = get_category(get_category($current_cat_id)->parent);
	$categories = get_categories(array(
		'orderby' => 'id',
		'parent' => $parent_cat->term_id,
		'hide_empty' => false,
	));
	echo '<nav class="aside-panel"><ul>';
	foreach ($categories as $category) {
		if ($category->term_id == $current_cat_id) $isThisCat = true;
		else $isThisCat = false;
		echo '<li class="panel-item';
			if ($isThisCat) echo ' is-active';
		echo '">
			<a href="' .get_category_link ($category->term_id). '" class="label">' .writeTitle($category->name). '</a>';
			if ($isThisCat) {
				echo '<ul class="drop-menu">';
					if ( have_posts() ){
						while (have_posts()) { the_post();
							echo '<li><a href="' .get_the_permalink(). '" class="link">' .nobrArticle(get_the_title()). '</a></li>';
							
						}
					}
				echo '</ul>';
			}
		echo '</li>';
	}
	echo '</ul></nav>';

<form>
<input type="button" value="Назад на предыдущую страницу" 
onClick="history.back()">
</form>