sizes
If you want to change the size of a single column, you can use one of the following classes:
-  
is-three-quarters -  
is-two-thirds -  
is-half -  
is-one-third -  
is-one-quarter -  
is-full 
The other columns will fill up the remaining space automatically.
You can now use the following multiples of 20% as well:
-  
is-four-fifths -  
is-three-fifths -  
is-two-fifths -  
is-one-fifth 
 is-full 
 is-four-fifths 
Auto
Auto
 is-three-quarters 
Auto
Auto
 is-two-thirds 
Auto
Auto
 is-three-fifths 
Auto
Auto
 is-half 
Auto
Auto
 is-two-fifths 
Auto
Auto
 is-one-third 
Auto
Auto
 is-one-quarter 
Auto
Auto
 is-one-fifth 
Auto
Auto
                    
                        
                        <div class="columns">
                          <div class="column is-four-fifths">is-four-fifths</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-three-quarters">is-three-quarters</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-two-thirds">is-two-thirds</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-three-fifths">is-three-fifths</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-half">is-half</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-two-fifths">is-two-fifths</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-one-third">is-one-third</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-one-quarter">is-one-quarter</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        <div class="columns">
                          <div class="column is-one-fifth">is-one-fifth</div>
                          <div class="column">Auto</div>
                          <div class="column">Auto</div>
                        </div>
                        
                    
                 columns system
As the grid can be divided into 12 columns, there are size classes for each division:
is-1is-2is-3is-4is-5is-6is-7is-8is-9is-10is-11is-12
is-1
1
1
1
1
1
1
1
1
1
1
1
is-2
1
1
1
1
1
1
1
1
1
1
is-3
1
1
1
1
1
1
1
1
1
is-4
1
1
1
1
1
1
1
1
is-5
1
1
1
1
1
1
1
is-6
1
1
1
1
1
1
is-7
1
1
1
1
1
is-8
1
1
1
1
is-9
1
1
1
is-10
1
1
is-11
1
is-12