I did it: Complete! and I used CSS

HTML & CSS
143

Yes, except that I believe that the inner table is preceeded by a <td>, isn’t it? It may not matter; I haven’t tested.

144

I don’t understand what you mean by that.

145 
td table {
    border-collapse:collapse;
}

However, like I said, it probably doesn’t matter if you target both the outer and inner tables.

146

That would be double lines: https://jsfiddle.net/1zuapwx5/18/

vs this way: no double lines: https://jsfiddle.net/1zuapwx5/17/

147

No, it wouldn’t. I misstyped “collapse” as “collopse”. Fixed now,

148

https://jsfiddle.net/1zuapwx5/19/ & https://jsfiddle.net/1zuapwx5/17/ both do the same thing, so which is right?

table {
    border-collapse: collapse;
}

or this way?

td table {
    border-collapse:collapse;
}
149

One moves it to the top left, the other moves it to the bottom right.

150

Both are right. The first one targets both the outer and inner tables. The second one targets only the inner table.

151

How come when I switch back and forth between browser tabs there’s a slight shift in the table?

152

How slight?

Does one tab have a vertical scroll bar while the other tab does not?

153

Looking at this which code is right?

154

Both are right.

The first selector targets only the inner table which means that the border spacing around the outer table is not collapsed.

The second selector targes both tables which means that the border spacing around both tables is collapsed.

Choice is yours.

155

oh, ok.

156

ok, now how would I remove the tables keeping everything looking exactly the way it is? https://jsfiddle.net/1zuapwx5/20/

157

Is there a simple way to do that?

158

All things are relative. Sit tight for about half an hour. OK?

159

so, there is a way to do that. ok

160

In order to do that, I believe I would need to replace <tr> and <td style with something else. But I don’t know what I would replace them with.

161

Take a look at a list of all the different HTML tags and try to think of which one best describes the content of each element in your page.If it is a block of content with no better tag available then make it a div.

162

ok… Now it looks like this: https://jsfiddle.net/1zuapwx5/21/ and not this https://jsfiddle.net/1zuapwx5/20/ What do I have to include that’s missing?