title: Can i put border to a form using bootstrap?
body: <p>I have this code below, and i want to add a border to make like a box using bootstrap class ".border", but i can't figure out why is not working!. Is possible using bootstrap v4?</p>
  
  <pre><code>&lt;div class="d-flex justify-content-center"&gt;
        &lt;form&gt;
          &lt;div class="form-group row"&gt;
            &lt;div class="col-sm-12"&gt;
              &lt;input type="email" class="form-control" id="inputEmail3" placeholder="Email"&gt;
            &lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="form-group row"&gt;
            &lt;div class="col-sm-12"&gt;
              &lt;input type="password" class="form-control" id="inputPassword3" placeholder="Password"&gt;
            &lt;/div&gt;
          &lt;/div&gt;
          &lt;div class="form-group row"&gt;
            &lt;div class=" col-sm-12"&gt;
              &lt;button type="submit" class="btn btn-primary"&gt;Sign in&lt;/button&gt;
            &lt;/div&gt;
          &lt;/div&gt;
        &lt;/form&gt;
      &lt;/div&gt;
  </code></pre>