@juanhermoso64: This theme is responsive theme, which mean the font size adjusts as per different screensize such as tablet, ipad, iphone, large desktop screen and small screens.
So when you edit the font size you need to be careful and edit all the fonts. So, I suggest you not to change the font size. See the style.css and responsive.css for more details about the font size.
For example if you want reduce the general content font size then you have to add all sets as below, in “Custom CSS” box in Theme Options panel.
body, button, input, select, textarea { font-size: 14px; }
@media screen and (min-width: 1190px) { body, button, input, select, textarea { font-size: 16px; } }
@media screen and (max-width: 1060px) { body, button, input, select, textarea { font-size: 14px; } }
@media screen and (max-width: 960px) { body, button, input, select, textarea { font-size: 13px; } }
@media screen and (max-width: 480px) { body, button, input, select, textarea { font-size: 12px; } }
So, if you really need to adjust then take expert help from CSS developer.
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