tokens: If you want to center the container div in a web page horizontally , just provide a width to the container element and use margin : auto ; that 's all you need , if you want to horizontally as well as vertically centered you need to use position : absolute ;
ner_tags: O O O O O O O B-HTML_XML_Tag O O B-User_Interface_Element I-User_Interface_Element O O O O O B-Variable O O O O O O B-Code_Block I-Code_Block I-Code_Block I-Code_Block O O O O O O O O O O O O O O O O O O O O B-Code_Block I-Code_Block I-Code_Block I-Code_Block