Go to your template's styles folder located at: /templates/yourtemplatename/styles/ and open the file called styles.css. At the top portion of the file you will see a line that says:
body {
font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
font-size: 0.8em;
height: 100%;
}
Replace the "Trebuchet MS" with whatever you want the default to be. CSS reads from left to right, with the farthest left being chosen first depending on what fonts the user's computer has installed.
For example:
body {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 0.8em;
height: 100%;
}
Would make Verdana the default font for your store.

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