Tiles not centered within web part in Sharepoint 2013

I am completely new to SharePoint and trying to design/create a page as requested by the company I work for. The issue I’m having is all the tiles I’ve created within a web part are aligned left. I did create a script editor and added a code that would automatically wrap the tiles so those scroll bars won’t appear; however the tiles are not lined up. Any way this can be achieved please? Thanks.enter image description here