Need help with css submit button box

Hey guys I have a wordpress newsletter plugin and I can customize CSS to make it better looking
I not a pro with css but I try

there is how the submit button look like in firefox. Dosent want to go higher.

I want the submit button to be at the same level as the input boxes if its possible

there is my css script

.wpmlwidget input.wpml {
    margin: -5px;
    padding: 2px 20px 2px 0;
}
input.ui-button {
border: 3px solid orange;
border-radius: 15px 15px 15px 15px;
margin: -200px 0px 0px 180px;
color: #55555;
width: 105px;
height: 105px;
}