Shadow of link size is bigger than size of button

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MVC4

Hi there,
I am using using link to open new tab in browser and button tag to look like button, this works fine however i face problem when i hover on button , shadow of link size is greater than size of button, i tried to set size of button bigger than size of link that dint work too, any suggestions will be appreciated.

Regards Asma

a href="@Url.Action("CreatePDF", "CreateApplicationFromSearch", new { Applicant_id = Model.applicant_id, Application_id = Model.application_id, ShowPDF = true })" target="_blank" >

What I have tried:

i tried to set size of button bigger than size of link that dint work too