WordPress 默认使用的用来来对图像的对齐和块元素的类：

.aligncenter,div.aligncenter{display:block;margin-left:auto;margin-right:auto}
.alignleft{float:left}
.alignright{float:right}
.wp-caption{background-color:#f3f3f3;border:1px solid #ddd;-khtml-border-radius:3px;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;margin:10px;padding-top:4px;text-align:center}
.wp-caption img{border:0 none;margin:0;padding:0}
.wp-caption p.wp-caption-text{font-size:11px;line-height:17px;margin:0;padding:0 4px 5px}

此外，有更多的 WordPress 默认的类标签，你可以选择你想要的风格：

.categories {...}
.cat-item {...}
.current-cat {...}
.current-cat-parent {...}
.children {...}
.pagenav {...}
.page_item {...}
.current_page_item {...}
.current_page_parent {...}
.current_page_ancestor {...}
.widget {...}
.widget_text {...}
.blogroll {...}
.linkcat{...}