Sure there is, see Application Parameters and URL Parameters - Reference - SAP Library and Stylesheets in Web Dynpro ABAP - Developing Web Dynpro ABAP Applications - SAP Library for details. The parameters that are relevant for your requirement are WDTHEMEROOT, WDUSEEXTERNALSTYLESHEET and WDFORCEEXTERNALSTYLESHEET. By default any WDA integrated in the portal, will inherit the theme of the portal so you can also customize that.
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