title: How do I style the datetime input using simple form in Rails 4
body: <p>I'm using simple form with slim to create the service form for my application.</p>
  
  <p>I have something like this code:</p>
  
  <pre><code>= f.input :start_at, input_html: { 'style' =&gt; 'width: 18%; display: inline' }
  </code></pre>
  
  <p>But I want something customized. How do I style with css each select input (day, month, year, hour, minutes) in simple form datetime input.</p>