No problem 馃檪 You can change the default size around line 155 near the top of your CSS –
/* Chrome fix */
body > div {
font-size: 20px;
font-size: 2.0rem;
}
body {
background-color: #fff;
color: #333;
font-family: 'Open Sans', sans-serif;
font-size: 20px;
font-size: 2.0rem;
font-weight: 300;
line-height: 1.625;
margin: 0;
}
That will only affect the default content. Things like titles/headings have their own font sizes and styling separately in the CSS.