.course_list{overflow:auto;flex-wrap:wrap;max-width:1310px;margin:0 auto}.course_card{height:var(--course-card-height);width:var(--course-card-width);margin:10px 10px 30px 10px;border:1px solid #e4e7ed;border-radius:4px}.course_card:hover{box-shadow:0 4px 8px 0 rgba(0,0,0,.2),0 6px 15px 0 rgba(0,0,0,.19)}.course_image{height:var(--course-img-height);width:100%;transition:all .5s}.course_image:hover{transform:scale(1.1)}.default_course_img{height:var(--course-img-height);width:100%;background-color:#f4f4f4}.course_name_link{margin-left:10px;line-height:40px}.course_name{font-size:18px;font-weight:700;white-space:nowrap;text-overflow:ellipsis;max-width:var(--course-name-max-width);overflow:hidden}.course_student_count{font-size:12px;color:#aeaeae;position:absolute;right:15px}.course_short_description{display:-webkit-box;-webkit-box-orient:vertical;font-size:12px;margin:10px;height:56px;line-height:1.5;word-break:break-word;-webkit-line-clamp:3;overflow:hidden}.difficulty_degree{margin-left:var(--difficulty-degree-margin-left)}.study_time{margin-left:var(--study-time-margin-left)}h1[data-v-22204934]{color:#fff;text-align:center;font-size:26px;vertical-align:middle}h3[data-v-22204934]{color:#666;margin-left:20px;display:flex;flex-grow:1;flex-shrink:1;justify-content:flex-start;align-items:center}.toolbar[data-v-22204934]{background:#ccc;height:60px;display:flex;justify-content:flex-start}.tools[data-v-22204934]{display:flex;justify-content:flex-end;margin-top:12px;margin-right:20px}.el-header[data-v-22204934]{background-color:#444;height:80px}.logo[data-v-22204934]{margin:10px}.grid-content[data-v-22204934]{border-radius:5px}.dataset-card[data-v-22204934]{width:220px;height:200px;cursor:pointer}.domain-list[data-v-22204934]{margin:0 auto;min-width:720px}.dataset-icon[data-v-22204934]{display:flex;justify-content:center;align-self:center;color:#eee;font-size:48px}.dataset-icon-selected[data-v-22204934]{display:flex;justify-content:center;align-self:center;color:#409eff;font-size:48px}.dataset-label[data-v-22204934]{padding:10px;text-align:center;height:90px;color:#409eff;size:20px;background-color:#eee}.dataset-label-selected[data-v-22204934]{padding:10px;text-align:center;height:90px;color:#eee;size:20px;background-color:#409eff}.dataset-detail[data-v-22204934]{background:#f5f7fa;min-height:600px}.card-header[data-v-22204934]{display:flex;justify-content:space-between;align-items:center;vertical-align:middle}.card-header-item[data-v-22204934]{font-size:samll;align-items:center;vertical-align:middle;color:#139734}.card-body-item[data-v-22204934]{margin-top:5px;width:100%;font-size:small;border-bottom:1px solid #d9d9d9}.detail-header[data-v-22204934]{padding:10px;color:#409eff;font-size:large}.datasetBg[data-v-22204934]{display:flex;width:220px;height:124px;background:url(../img/bg.1739ab63.png) no-repeat}.description-body[data-v-22204934]{margin:20px}.search-bar[data-v-22204934]{width:200px;height:50%;top:33%;margin-right:20px}.main_content_header{padding:20px}.main_content_card,.main_content_header{max-width:1350px;margin:0 auto}.book_list{padding-left:var(--book-padding-left);overflow:auto;flex-wrap:wrap;max-width:1310px;margin:0 auto}.book_card{height:360px;width:240px;margin:10px 10px 30px 10px;border:1px solid #e4e7ed;border-radius:4px}.book_card:hover{box-shadow:0 4px 8px 0 rgba(0,0,0,.2),0 6px 15px 0 rgba(0,0,0,.19)}.book_image{height:240px;width:100%;transition:all .5s}.book_image:hover{transform:scale(1.1)}.default_book_img{height:240px;width:100%;font-weight:700;font-size:30px;color:grey;padding:90px;background-color:#f4f4f4}.book_name_link{margin-left:10px;line-height:40px}.book_name{font-size:18px;font-weight:700;white-space:nowrap;text-overflow:ellipsis;max-width:230px;overflow:hidden}.logo_and_title{display:flex}.system_title{color:#fff;font-size:24px;font-weight:700;margin:13px 0 0 10px}.page_menu{justify-content:center}.login_button{color:#fff;text-decoration:none;line-height:60px;width:60px;position:absolute;right:0}.page_main{height:calc(100vh - 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