The logo in the welcome page of my form is coming out really tiny no matter what I do

I put my logo on the custom welcome page and it is coming out really tiny no matter what I do. See screenshot. How can I adjust the size?

You have to make sure to remove the extra blank areas around the image. The logo should have no paddings. You can do it like this: 

https://www.jotform.com/resources/assets/logo/jotform-logo-white-400x100.jpg 

The output would be like this: https://form.jotform.com/201705829584058.