.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } .embed_fourthIndustry { padding-bottom: 45%; background: url('https://newsroom-prd-data.s3.ap-northeast-2.amazonaws.com/wp-content/uploads/2017/12/ebook-event-bg.png') no-repeat center top; } .embed_fourthIndustry div { position: relative; margin: 0 auto; width: 750px; height: 425px; } @media (max-width: 1144px){.embed_fourthIndustry { padding-bottom: 56.25%; } .embed_fourthIndustry div { width: auto; height: auto; padding-bottom: 56.25%; }} img{display:block;}