Hello ABHISHEK CHAUDHARY,
Add he below CSS code to increase the font size.
1. For heading size and line height
h4 {
font-size: 20px !important;
line-height: 1.3em;
}
2. For body font size.
.entry-content p, .details {
color: #2d2d2d;
font-size: 16px;
}
Hope, this will solve your issues.
Regards
