Adding classes to inputs and labels in Umbraco Forms

 <div class="row-fluid">
                    @foreach (var c in fs.Containers)
                    {
                        <div class="umbraco-forms-container @("col-md-" + c.Width)">
...

in theme default - form.cshtml

for the cols. it’s pretty rudimentary.. 1 col for anything below the md breakpoint.

But knowing this your css could override the col-md-4, with breakpoint options?