This is a responsive Social Share sidebar. This side bar is static and does not scroll with page scroll. Also, as this is responsive, it changes its layout and shifts to bottom if the screen size changes.
f you are not satisfied with your current share buttons, you can try this solution. Advantage of using this extension is that, it goes well with your layout, and you don’t have to rely on bulky files that are loaded from anonymous servers, which could also slow down the page loading time significantly.