body{overflow:auto}.secondary_battery_con{width:1200px;margin:100px auto;text-align:center}.secondary_battery_title{position:relative;font-size:32px;font-weight:700;margin-bottom:50px}.secondary_battery_title:after{content:"";position:absolute;left:47.5%;bottom:54px;width:5%;height:3px;background-color:#00aeff}@media (max-width:1200px){.secondary_battery_con{width:80vw}}@media (max-width:810px){.secondary_battery_con{width:95vw}.secondary_battery_title{font-size:24px;margin-bottom:30px}.secondary_battery_title:after{display:none}}