We are actually using height instead of padding and you can alter it by adding the block of codes below into /templates/esmobile/css/custom.css

[gist]
body .es-mobile-footbar__link,
body .es-mobile-footer {
height: 50px;
}

body .es-mobile-content {
height: calc(100% - 48px - 46px);
}
[/gist]