You can style any C1Upload elements using CSS styles to make their appearance truly unique. To make the customization process easier, ComponentOne includes CSS selectors for each of its six built-in themes. For more information on themes, see Built-in Wijmo Themes.
You can apply general CSS properties such as background, text, font, border, outline, margin, padding, list, and table to applicable CSS selectors.
For a list of common individual CSS selectors and grouped CSS selectors, select the C1Upload control in your project, and view the drop-down list next to the CssClass property in the Visual Studio Properties window. C1Upload CSS selectors start with wijmo-wijupload:
You can combine the individual CSS selectors as a group to make the CSS selector more specific and strong.