[Theme Horse Support Team]

Hi,

Add below custom CSS code in Appearance > Customize > Ambition Theme Options > Custom CSS
to increase the font size of post title and content as well as line height between the lines.

.entry-title {
	font-size: 30px !important;
	line-height: 30px !important;
}
body, input, textarea, select {
	font-size: 16px !important;
	line-height: 16px !important;
}

Note: Increase the digit value above to increase the font size and line height.

Thank you!