Removing unwanted table cell borders with CSS

Answer 1

After trying the above suggestions, the only thing that worked for me was changing the border attribute to "0" in the following sections of a child theme's style.css (do a "Find" operation to locate each one -- the following are just snippets):

.comment-content table {
    border-bottom: 1px solid #ffffd;

.comment-content td {
    border-top: 1px solid #ffffd;
    padding: 6px 10px 6px 0;
}

Thus looking like this afterwards:

.comment-content table {
    border-bottom: 0;

.comment-content td {
    border-top: 0;
    padding: 6px 10px 6px 0;
}