Apr 11, 2016 · Custom logo optionally clickable: Select the image and upload your own JPG, PNG, or GIF with a resolution of 200 x 50 pixels, no larger than 10 KB. This appears in the top navigation bar on every page. Top Nav Background image: Your own JPG, PNG, or GIF, no larger than 15 KB. The background image appears in the top navigation bar on every page. The SharePoint design system leverages the power of Office UI Fabric and the SharePoint Framework to make it easy to get started quickly in creating your next web part. Web part basics Leverage the basic building blocks of a modern web part to work great on any page.