.qna_icon{background-repeat:no-repeat;background-size:cover}.qna_training_ic{height:45px;width:46px}.qna_instant_ic{height:40px;width:44px;background-position:-48px}.qna_efficient_ic{height:40px;width:44px;background-position:-95px}.qna_no_limit_ic{height:40px;width:44px;background-position:-143px}.qna_truly_smart_ic{height:40px;width:44px;background-position:-190px}.qna_group_mind_ic{height:40px;width:44px;background-position:-235px}.qna_knowledge_smart_media{margin-bottom:2rem;margin-top:2rem}@media screen and (min-width:768px){.qna_banner{background-image:url(/static/assets/img/grey_back.png)}.qna_banner_block{padding-top:3rem;padding-bottom:5rem}.qna_knowledge_smart_media{margin-bottom:5rem;margin-top:5rem}.qna_knowledge_left_block{padding-right:6%}.b_banner_art{margin-top:-50px}}