.questionBank-box{width:100%;height:auto;display:flex;margin-top:20px}.box-left{width:200px;min-height:715px;height:auto;border:1px solid #d7d7d7}.left-header{width:calc(100% - 36px);height:30px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.header-size{font-size:12px;color:#000}.header-add{color:#409eff;font-size:16px}.left-tree{width:calc(100% - 8px);height:auto;margin:0 auto}.box-right{width:calc(100% - 240px);min-height:715px;height:auto;margin-left:20px}.btn-excel{display:flex;align-items:center;margin-bottom:10px}.preview-main{width:100%;height:auto;min-height:700px;display:flex;background-color:#f2f3f5}.preview-left{width:200px;height:auto;background-color:#fff}.preview-box{width:calc(100% - 32px);height:auto;margin:0 auto}.preview-title{font-size:18px;color:#000;padding-top:40px}.preview-count{font-size:12px;color:#000;margin-top:30px}.preview-right{width:calc(100% - 220px);height:auto;background-color:#fff;margin-left:20px}.preview-content{width:calc(100% - 60px);height:auto;margin:0 auto}