[Theme: Skirmish] Changing Blog Post font in stylesheet

I’m trying to change the blog post font, which is too small, and cannot find the proper text area coding in this theme. The following allowed me to change the font color but the font size views as 10px. The website is carmenamato.net and the coding for content is as follows:

/* =Content
———————————————– */

.sticky {
border:1px solid #ddd;
background:#f8f8f8;
padding:20px !important;
margin:0 0 20px 0;
}
.post{padding:0 0 40px 0;}

.entry-title, .page-title{margin:0; text-transform:capitalize;}
.entry-title a, .page-title a{color:#000;}
.entry-title a:hover, .page-title a:hover{color:#723710;}

.page-title{font-size:18px; margin-bottom:20px;}

.entry-meta {
margin:0 0 12px 0;
font-size:16px;
font-family:georgia;
color:#333333;
font-style:italic;
clear: both;
}
.hentry {
margin: 0 0 1.5em;
}
.byline {
display: none;
}
.single .byline,
.group-blog .byline {
display: inline;
}
.entry-content, .entry-summary {
margin: 1.5em 0 0;
}

This coding is included at the beginning of the theme stylesheet and I’m wondering if it has an imapct on the display:

}
html {
font-size: 62.5%; /* Corrects text resizing oddly in IE6/7 when body font-size is set using em units https://clagnut.com/blog/348/#c790 */

Any help much appreciated!

https://www.ads-software.com/extend/themes/skirmish/