Issue with centering the elements from html begin form in row - css

Question

I have a begin form with input elements and text label. For some reason I cannot center the form in the middle of row. I tried text-align center and it centers only the text not buttons or input fields.
or I tried to apply separate css styles on each element but it is messing around the form.
What is wrong with it?
<section class="my-posted-jobs">
<div class="row">
<div class="col-md-6" </div>
<div class="specific-job col-md-6">
<div class="row test">
<div class="form-horizontal">
<h1>Edit Post</h1>
#Html.ValidationSummary(true, "", new { #class = "text-danger" })
#Html.HiddenFor(model => model.JobPostId)
<div class="form-group">
#Html.LabelFor(model => model.Headline, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.Headline, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.Headline, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.JobAddress, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.JobAddress, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.JobAddress, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.AboutJob, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.AboutJob, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.AboutJob, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.JobCity, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.JobCity, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.JobCity, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
#Html.LabelFor(model => model.JobPostCode, htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.EditorFor(model => model.JobPostCode, new { htmlAttributes = new { #class = "form-control" } })
#Html.ValidationMessageFor(model => model.JobPostCode, "", new { #class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Save" class="btn btn-default" />
</div>
</div>
</div>
}
</div>
</div>
</div>
</section>