How to make 2 fields on one line?

Question

css

Began to saw columns of filling of the internal information and there is a trabl.
How to create 2 input fields in one line? so that it is so

and not in a line as it turns out for me

<div class='form-row'>
      <label for='form_fname'>First Name: </label>
    		<input type='text' id='form_fname' name='first_name'>
  		</div>

  		<div class='form-row'>
    		<label for='form_sname'>Second Name: </label>
    		<input type='text' id='form_sname' name='second_name'>
    </div>

Answer 1

For example
Or
Div initially has width = auto, or 100%