CSS inserting horizontal scrolbar

/* main general */ #maincontent{padding:10px} #maincontent h1{padding:5px; font-size:1.4em; line-height:1.19em; font-weight:normal; margin:0 -5px 10px -5px} #maincontent h2{font-size:1.6em; font-weight:normal} #maincontent h2 a{text-decoration:none} #maincontent h3{margin:20px 0 10px} #maincontent .cat-children ul dl dt, #maincontent .cat-children ul dl dd, #maincontent dl.article-count dt, #maincontent dl.article-count dd{display:inline; margin:0px} #maincontent .items-row h2{font-weight:normal; padding:0px 0px 0px 0px; font-size:1.4em} #maincontent ul.subcategories{margin:20px 20px 20px 10px} #maincontent .subcategories-link{font-weight:bold} #maincontent ul{list-style-position:outside; list-style-type:square; padding:0 0 0 15px; margin:10px 0 10px 0px} #maincontent ol{padding:0 0 0 20px; margin:10px 0 10px 0px; list-style-position:outside} #maincontent ul li, #maincontent ol li{ padding:0; line-height:1.7em; margin: 0} #maincontent .category-list{padding:0 5px; display:block} #maincontent .category-list h1{margin-left:-5px; margin-right:-5px} #maincontent .categories-list ul{margin:0px 0 0 20px; padding:0} #maincontent .categories-list ul li{padding: 5px} #maincontent .categories-list ul ul{margin-left:15px} .category-desc{line-height:1.7em; margin:10px 0; padding-left:0px} .image-left{float:left; margin:0 5px 5px 0} .image-right{float:right; margin:0 0 5px 5px} .archive{padding:0 5px} .archive form{padding:0 5px} .categories-list{padding:0 0px} ul#archive-items{margin:20px 0 20px 0px; list-style-type:none; padding:0} ul#archive-items li.row0, ul#archive-items li.row1{padding:10px 0; margin:10px 0} .category{width:100%} categroy.thead.tr{border:1px solid #fff} .list-hits{text-align:center} .display-limit{padding-bottom:10px;}