.square-div{position:relative}.square-div:before{content:"";display:block;padding-bottom:100%;width:100%}.square-div>*{left:0;position:absolute;top:0}@media (min-width:1680px){.container.container-ext{max-width:1440px}}@media (min-width:1920px){.container.container-ext{max-width:1748px}}