Reply To: Change search results background color

This will make the background darker so the white text can be seen.
Add this to Customize > Additional CSS:

.post-wrapper {
    background: #000;
}

or   this to make it slightly transparent:

.post-wrapper {
    background: rgba(0,0,0,.7);
}

I can’t see any table layout in the search results so I hope this is what you are looking for.