Blue Expand and Contract Icons that go Down and Up or Right and Left. (Zip includes AI layered formats, as well as 16, 24, 32, and 48 PNG versions of all icons) expand down expand right contract up 矢量展开和收缩图标
Cool way to make a responsive thumbnail grid with an expanding image preview just like in Google images. CSS/HTML (see authors site for tutorial) 时尚 现代 创意 Responsive Thumbnail Expand Preview CSS/HTML