This is a html, css only built responsive apartment/building. Every tiny detail in there is all html/css.
Try resizing the screen and play with it.
Demo link : https://codepen.io/girishpatil/pen/yqgvjY
By : Girish Patil (https://evilhead.me)
Follow me on twitter : https://twitter.com/theevilhead
Originally designed by : Leslie Wilkins
Checkout the design here : https://dribbble.com/shots/1401986-Building-Illustration