BigCommerce Template amendments

We need a few changes on an existing BigCommerce template - mostly simple decorative tweaks - about 3 hours of work. Examples of what we need doing: upload background image (currently there is no white behind text so we upload the image and then can't read the text!), change margins, centring of icons and photos, make navigation collapsible - little changes like these. We estimate 3 hours worth of work for now, but we are looking for our go-to web person who can help us with bigger projects in future so this could develop into more for the right person. Please write and show us examples of sites you have built.