beetl 模板和media冲突导致页面消失

\@media print {
    .nav div.active {
	    background-color: #0bf;
	}
	.title-blue1{ background-color: #0bf;}
	.echarts-head{ background-color: #def4fd;}
	.gd_tman1 p{ background-color: #06d0fe;}
	.gd-table th{ background-color: #aef4fe;}
}  
//在media前面加上斜杠即可