Hi Mandeep,
For designing the Excel Export content (so static column data, dynamic data, data over association, multiple worksheets) the Excel Exporter module can be downloaded from the AppStore.
For actual (conditional) formatting and styling there is -as fas as I know- no out-of-the-box solution yet. If that is needed you need to add some Java action to handle the downloaded Excel or create the export yourself. For this you need Java knowledge and the libraries:
are needed. This is no easy road to take unless you have experience with this.