Sidebar and gallery lightbox

Hi there, i would like to know if is possible to create a fixed sidebar region like this site :
http://preview.themeforest.net/item/veni-multipurpose-ecommerce-wordpress-theme/full_screen_preview/19539854?_ga=2.251821769.1337998572.1495449968-253306551.1495115684 and if is possible to maximise the images on gallery like this site :
http://preview.themeforest.net/item/hotel-xenia-hotel-wordpress-theme/full_screen_preview/19235165?_ga=1.207473690.804510776.1488280210 by clicking more and then gallery. Thanks.
Luca.