OK Solved it.
For anyone like who faces this issue –
Cope this code from the original style.css from the parent Amadeus Theme –
body {
font-family: ‘Font Name’, Font Family;
font-size: 20px;
color: #4c4c4c;
word-wrap: break-word;
background-color: #f7f3f0;
line-height: 1.6;
}
and paste in the style.css of your child theme.
Replace the font name and font family with your desired fonts. You can also change the font size by changing the number in font-size row.
Hope it helps.