You can not have stylesheet.css and stylesheet1.css without issues
Zen Cart loads each .css files in order. Delete or rename stylesheet1.css to any extention other than .css
Then you have in the latter
body {
Code:
margin: 0;
font-family: verdana, arial, helvetica, sans-serif;
font-size: 8px;
color: #000000;
background-color:#FFFFFF;
}
and in your current stylesheet
Code:
body {
margin: 0;
font-family: verdana, arial, helvetica, sans-serif;
font-size: 75px;
color: #000000;
background-color:#FFFFFF;
}
This should be a percentage and by default is 62.5% - - try setting it back to that