title: Semantic UI centre aligned login box?
body: <p>I am using the Semantic UI framework for my website. I want to place the login box in the centre of the page.I want only the login box in the page. I don't understand how to centre aligned using Semantic UI 'grid classes'. Please help me how to fit the login box.</p>
  
  <p>My Code:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html lang="en"&gt;
  &lt;head&gt;
  &lt;meta charset="UTF-8"&gt;
  &lt;title&gt;my semantic website&lt;/title&gt;
  &lt;link rel="stylesheet" href="../css/semantic.min.css"&gt;
  &lt;link rel="stylesheet" href="../css/style.css"&gt;
  &lt;script src="../js/jquery-2.1.1.min.js" type="text/javascript" charset="utf-8" async defer&gt;     &lt;/script&gt;
  &lt;script src="../js/semantic.min.js" type="text/javascript" charset="utf-8" async defer&gt;&lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div class="ui grid"&gt;
      &lt;div class="one column row"&gt;
          &lt;div class="ui padded grid"&gt;
              &lt;div class="three column row"&gt;
                  &lt;div class="column"&gt;
                      &lt;div class="ui segment"&gt;
                          &lt;h4 class="ui dividing header"&gt;Account Info&lt;/h4&gt;
                          &lt;div class="ui form"&gt;
                              &lt;div class="field"&gt;
                                  &lt;label for="username"&gt;Username: &lt;/label&gt;
                                  &lt;div class="ui icon input"&gt;
                                      &lt;input type="text" placeholder="Username" name="username" id="username"&gt;
                                      &lt;i class="user icon"&gt;&lt;/i&gt;
                                  &lt;/div&gt;
                              &lt;/div&gt;
                              &lt;div class="field"&gt;
                                  &lt;label for="password"&gt;Password: &lt;/label&gt;
                                  &lt;div class="ui icon input"&gt;
                                      &lt;input type="password" placeholder="Password" name="password" id="password"&gt;
                                      &lt;i class="lock icon"&gt;&lt;/i&gt;
                                  &lt;/div&gt;
                              &lt;/div&gt;
                              &lt;input type="submit" name="submit" class="ui inverted blue button"&gt;
                          &lt;/div&gt;
                      &lt;/div&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>