Logo size in web and mobile is different

Logo size in web and mobile is different

Hi, 

we are happy to use the Zoho email campaign, yet we found major differences between website interfaces and mobile interfaces. I have already created an email campaign with smartphone theme and our logo is on top (2 rows) with 30:70. yet we could not find the solution why the logo is getting bigger once in mobile interfaces. your help or opinion would be a great input for us. Thank you