It's unlikely you'll have a child theme in a test site, so we'll use Additional CSS in Customize. First, let's change the table attributes. We'll make the border blue and the background color a lighter blue, and maintain the current width by adding the following code into Additional CSS:
.content table {
width: 580px;
border: 2px solid #352ece;
background-color: #cbfcfc;
}
Now click on Publish, and refresh page to see the changes.
"I've added the CSS code, clicked on Publish, and refreshed the page, but the table's exactly the same,
what have I done wrong?"" Answer: Nothing. HTML code will always overrule CSS code, so now we need to delete the HTML code within the table tag, The tag should now look like this:
<table>
click on Preview and the table border should be blue, background color light blue, and width the same.
I will be honest with you...this training is way above my skill level, but I am saving it for when it isn't. Thanks for putting it out there.
Have a Great Day!
-Chuck