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auto;min-width:1240px}.video-student .wrapper .side_nav[data-v-a000c89a]{width:200px}.video-student .f_mtb30[data-v-a000c89a]{margin-top:30px;margin-bottom:30px}.video-student .content_box[data-v-a000c89a]{width:1020px;border:1px solid #ddd}.clearfix[data-v-a000c89a]{clear:both;zoom:1}.pull-left[data-v-a000c89a]{float:left}.pull-right[data-v-a000c89a]{float:right}