Interactions on mouse over

Hello Weblfow lovers,

Please help. I am trying to do some interaction for home developer showing which apartment is free and which is sold and would love to do it the way :

have no clue how to do it - should i change the background on mouse over use some svg change? nothing is really working for me to to the effect as on the film:(

i would be grateful for any tip.


Here is my public share link: LINK
(how to access public share link)