minor css fix

src/main/webapp/WEB-INF/jsp/view.jsp

@@ -67,7 +67,7 @@
 				+ "=" + request.getAttribute("groupId");
 	%>
 	<p style="margin-top: 20px;">
-		<button class="btn btn-large btn-fill"
+		<button class="btn btn-primary btn-lg btn-fill"
 			onclick="window.location.href='<%=acceptInviteURL%>'" type="button">
 			Continue accept invite on
 			<c:out escapeXml="true" value="${vreName}" />
@@ -117,7 +117,7 @@
 									name="email" value="${inviteInstance.invitedEmail}" readonly
 									id="email" style="color: #999;" /> 
 								<div style="margin-top: 20px;">
-									<button class="btn-primary btn-large btn-fill" type="button"
+									<button class="btn btn-primary btn-lg btn-fill" type="button"
 										id="createAccountButton">Continue</button>
 								</div>
 							</fieldset>