Hi PaulNivy….thanks for the link. However, to be fair, it’s extremely difficult to know what specifically you are referring to when something doesn’t look right. So if there is something specific, please let me know by desribing it or screenshots of your own site and not from an online tool such as the one you posted. The best method is real world viewing with your own screenshots and to provide the browser and version being used.
That online tool to generate what a website looks like in over 200+ browsers is very difficult because I don’t know what versions you selected. This theme is not built for all browser versions, only the more recent modern ones.
As for the validation, unfortunately, the bulk of those are your own content and plugins being used. So my best recommendation is to go through your source code based on the line numbers it shows and pinpoint where and what needs to be adjusted. For example, many are the style attributes for your own list icons you are using.