nesting
You can nest columns to have more flexibility in your design. You only need to follow this structure:
-  columns: top-level columns container-  column-  columns: nested columns-  columnand so on…
 
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The difference with multiline columns is the order in the HTML code: all the blue columns appear before the red ones. Resize to a narrower viewport to see the result.
First column
First nested column
Second nested column
Second column
50%
Auto
Auto
Multiline columns will also have a gap between each line.
                    
                        
                        <div class="columns">
                          <div class="column">
                            <p class="bd-notification is-info">First column</p>
                            <div class="columns is-mobile">
                              <div class="column">
                                <p class="bd-notification is-info">First nested column</p>
                              </div>
                              <div class="column">
                                <p class="bd-notification is-info">Second nested column</p>
                              </div>
                            </div>
                          </div>
                          <div class="column">
                            <p class="bd-notification is-danger">Second column</p>
                            <div class="columns is-mobile">
                              <div class="column is-half">
                                <p class="bd-notification is-danger">50%</p>
                              </div>
                              <div class="column">
                                <p class="bd-notification is-danger">Auto</p>
                              </div>
                              <div class="column">
                                <p class="bd-notification is-danger">Auto</p>
                              </div>
                            </div>
                          </div>
                        </div>
                        
                    
                  
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                    