Change Fonts single post (point themes by mythemeshop.com)

Hi guys,

Need help on how to change the fonts color of my wordpress theme.

I tried to change code at style.css which is:

/*-[ Framework ]--------------------*/
body {
    font: 14px/23px Droid Sans, sans-serif;
    color: #555;
    background-color: #FFFFFF;

But the amendment will only change the fonts at homepage. Really hope u guys can help as the fonts too light to read. It almost blend with background colour.