<div style="text-align: center;"><div class="sketchfab-embed-wrapper"> <iframe title="EW - 5045 - 003N 3D" frameborder="0" allowfullscreen mozallowfullscreen="true" webkitallowfullscreen="true" allow="autoplay; fullscreen; xr-spatial-tracking" xr-spatial-tracking execution-while-out-of-viewport execution-while-not-rendered web-share width="100%" height="480" src="https://sketchfab.com/models/c575b55feb8d4d30b7082903cc723f09/embed?ui_infos=0&ui_stop=0&ui_inspector=0&ui_watermark_link=0&ui_watermark=0&ui_ar=0&ui_help=0&ui_settings=0&ui_vr=0&ui_annotations=0"> </iframe> </div></div>

こんなかんじで。