You can use an Excel theme or style in Spread.Sheets. This requires that a style link is added to the head section of the aspx page. For example:

<link rel="stylesheet" href="css/gc.spread.sheets.excel2013white.11.0.0.css" />

The Excel 2013 theme also applies to the tab strip and scroll bars.

The following themes are available:

Name	CSS File
Excel 2007	gc.spread.sheets.11.0.0.css
Excel 2013 White	gc.spread.sheets.excel2013white.11.0.0.css
Excel 2013 Light Gray	gc.spread.sheets.excel2013lightGray.11.0.0.css
Excel 2013 Dark Gray	gc.spread.sheets.excel2013darkGray.11.0.0.css
Excel 2016 Colorful	gc.spread.sheets.excel2016colorful.11.0.0.css
Excel 2016 Dark Gray	gc.spread.sheets.excel2016darkGray.11.0.0.css

You can also combine the Excel theme with other themes such as the bootstrap theme. For example:

<link rel="stylesheet" href="css/gc.spread.sheets.excel2013white.11.0.0.css" />

<link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" title="aa" />
<link rel="stylesheet" href="css/bootstrap/bootstrap-theme.min.css" title="aa" />

Use the refresh method if you change a theme.