Hi Viral,
Mary Evans and Frank Ralf provided all the details for the missing lines in the themes forum. In cPanel open the general.css file in anomaly/styles and add at the bottom:
#page-mod-lesson-view th,
#page-mod-lesson-view td {
border-width: 1px;
}
I tried it in the anomaly theme and it worked.
With kind regards,
Hartmut