Font embedding problem from html

Hi!

When I convert from html it always embeds the fonts incorrectly, because it doesn't display the font type. Is there any way to fix this?

Example from html:
.calibre {
display: block;
font-family: "Times New Roman";
font-size: 1em;

Example from docx:
.calibre {
display: block;
font-family: "Times New Roman", serif;
font-size: 1em;

Thx in advance!