title: bulma field class doesn't create margin bottom
body: <p>I have a search input and then an html table like this:</p>
  
  <pre><code>&lt;form action="/providers/search" method="get"&gt;
      &lt;div class="field has-addons"&gt;
          &lt;div class="control"&gt;
              &lt;input class="input" name="q" type="text" placeholder="Search for every columns"&gt;
          &lt;/div&gt;
          &lt;div class="control"&gt;
              &lt;button type="submit" class="button is-primary"&gt;Search&lt;/button&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/form&gt;
  
  &lt;table class="table is-bordered is-striped is-narrow is-fullwidth" &gt;
      &lt;thead&gt; 
          &lt;tr&gt;        
              &lt;th&gt;Name&lt;/th&gt;
              &lt;th&gt;Website&lt;/th&gt;
              &lt;th&gt;Login&lt;/th&gt;
              &lt;th&gt;Password&lt;/th&gt;
              &lt;th&gt;Email&lt;/th&gt;
              &lt;th&gt;Description&lt;/th&gt;
              &lt;th&gt;&lt;/th&gt;       
          &lt;/tr&gt;   
      &lt;/thead&gt;
      ...
  &lt;/table&gt;
  </code></pre>
  
  <p>the problem is the search input is stack directly on the html table, i think the .field class doesn't create the margin between input and table.</p>
  
  <p>here is what i'm getting:</p>
  
  <p><a href="https://i.stack.imgur.com/9uGhz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9uGhz.png" alt="enter image description here"></a></p>
  
  <p>is there something wrong?</p>