Yes, you can use the Gallery.CssClass Property to specify the fonts for the gallery.

 

For example,

 

.container {
       FONT-SIZE: 12px;
       FONT-FAMILY: arial,helvetica,sans-serif MARGIN: 0px;
       TEXT-ALIGN: left;       
       .......      
       .......
}

<CE:Gallery
    id="gallery1"
    runat="server"
    Height="500"
    Width="600"
    Column = "8"
    MaxImageWidth="1024"
    BackColor="#ffffff"
    CellPadding="5"  
    AutoResizeUploadedImages = "true"  
    CellSpacing="5"
    ForeColor="#000000"
    BorderColor="#cc0000"
    BorderStyle="solid"
    BorderWidth="0"
    CssClass="container"
    ShowUpload="true"
    ShowEditDescription="true"
    ShowThumbNailName="true" 
    ShowThumbNailSize="true" 
    ShowThumbNailDate="false" 
    ShowThumbNailDescription="true" 
    FolderPath = "~/samplefolder"
    >
</CE:Gallery>