Graham bemethavinci The web version is controlled by
/* RESPONSIVE TEMPLATE */

/* WIDTH 640PX */

@media only screen and (min-width: 630px) {
body {
max-width: 630px;
margin :10px auto;
}
near the bottom of your css
there are also similar settings for various elements to resize them above or below the 630px level in your css ie .post class
the basic font size is set in the 'body' class at the top of the file