.duan{width:700px;margin:20px auto 0 auto;border:0}.terminal{cursor:pointer;font-size:20px;line-height:60px;color:#666;height:60px;font-weight:600;text-align:center}.terminal.active{color:#000;border-bottom:4px solid #000;transition:background-color 1s;transition:all .5s ease}.line_bottom{position:absolute;bottom:-1px;background:#1a7af8;border-radius:1px;height:4px;width:100%}.applicable_scenario_li .line_bottom{width:60px;height:2px;background:#fff;margin:0 auto}