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HTML

              
                
<h1 class="ui center aligned yellow header">Semantic UI Grid</h1>

<div class="ui basic center aligned segment">
  <div class="ui horizontal divider"> <!-- .horizontal class is mandatory here -->
    <div class="ui big buttons custom_toggle">
      <button class="ui inverted active blue button" id="fixed">Fixed</button>
      <div class="or"></div>
      <button class="ui inverted blue button" id="fluid">Fluid</button>
    </div>
  </div>      
</div>

<div class="ui hidden divider"></div>

<div class="ui center aligned grid container">
  <h2>Basic 16</h2>

  <div class="row"> <!-- .row element is not mandatory, .column is enough for grid to work -->  
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>    
  </div>  
  
  <h2>16/5 || 4x8x4</h2>

  <div class="five column row">
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>    
  </div>  
  <div class="row">
    <div class="four wide column">
      <p><span>Four</span></p>
    </div>
    <div class="eight wide column">
      <p><span>Eight</span></p>
    </div>
    <div class="four wide column">
      <p><span>Four</span></p>
    </div>
  </div>
  
  <h2>Relaxed 4x8x4</h2>
  
  <div class="relaxed row">
    <div class="four wide column">
      <p><span>Four</span></p>
    </div>
    <div class="eight wide column">
      <p><span>Eight</span></p>
    </div>
    <div class="four wide column">
      <p><span>Four</span></p>
    </div>
  </div>  
  
  <h2>Floated</h2>
  
  <div class="five column row">
    <div class="left floated column">
      <p><span>Left</span></p>
    </div>
    <div class="right floated column">
      <p><span>Right</span></p>
    </div>
  </div>
</div>

<div class="ui center aligned equal width grid container">
  <h2>Equal width</h2>  

  <div class="equal width row">
    <div class="column"><p><span>=</span></p></div>
    <div class="column"><p><span>=</span></p></div>
    <div class="column"><p><span>=</span></p></div>
  </div>    
  <div class="equal width row">
    <div class="column"><p><span>=</span></p></div>
    <div class="column"><p><span>=</span></p></div>
  </div>
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Celled</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui three column center aligned celled grid container">
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
</div>  

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Internally Celled</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui three column center aligned internally celled grid container">
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Divided</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui three column center aligned divided grid container">
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Vertically Divided</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui three column center aligned vertically divided grid container">
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
  <div class="row">
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
    <div class="column"><p></p></div>    
  </div>  
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Nested</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui two column center aligned grid container">
  <div class="column">
    <div class="ui three column grid" id="nested_1">
      <div class="column"><p></p></div>
      <div class="column"><p></p></div>
      <div class="column"><p></p></div>
    </div>
  </div>
  <div class="column"><p></p></div>
  <div class="column"><p></p></div>
  <div class="column">
    <div class="ui grid" id="nested_2">
      <div class="four wide column"><p></p></div>
      <div class="twelve wide column">
        <div class="ui equal width grid" id="nested_3">
          <div class="column"><p></p></div>
          <div class="column"><p></p></div>
        </div>
      </div>
    </div>
  </div>
  <div class="ui hidden divider"></div>  
</div>

<div class="ui hidden divider"></div>

<div class="ui equal width center aligned grid container" id="color_vars">
  <h2>Color variations</h2>

  <div class="row">
    <div class="red column"><p></p></div>
    <div class="orange column"><p></p></div>
    <div class="yellow column"><p></p></div>
    <div class="olive column"><p></p></div>
    <div class="green column"><p></p></div>    
    <div class="teal column"><p></p></div>
    <div class="blue column"><p></p></div>
    <div class="violet column"><p></p></div>
    <div class="purple column"><p></p></div>
    <div class="pink column"><p></p></div>
    <div class="brown column"><p></p></div>
    <div class="grey column"><p></p></div>
    <div class="black column"><p></p></div>    
  </div>  
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Stackable (mobile)</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui stackable four column center aligned grid container">
  <div class="row">
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
    <div class="column"><p></p></div>
  </div>  
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Reverse order (mobile)</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui mobile reversed four column center aligned grid container">
  <div class="row">
    <div class="column"><p><span>1</span></p></div>
    <div class="column"><p><span>2</span></p></div>
    <div class="column"><p><span>3</span></p></div>
    <div class="column"><p><span>4</span></p></div>
  </div>  
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Doubling column width (mobile)</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui center aligned grid container">
  <div class="doubling eight column row" id="db_1">
    <div class="column"><p><span>1</span></p></div>
    <div class="column"><p><span>2</span></p></div>
    <div class="column"><p><span>3</span></p></div>
    <div class="column"><p><span>4</span></p></div>
    <div class="column"><p><span>5</span></p></div>
    <div class="column"><p><span>6</span></p></div>
    <div class="column"><p><span>7</span></p></div>
    <div class="column"><p><span>8</span></p></div>
  </div>
  <div class="doubling six column row" id="db_2">
    <div class="column"><p><span>1</span></p></div>
    <div class="column"><p><span>2</span></p></div>
    <div class="column"><p><span>3</span></p></div>
    <div class="column"><p><span>4</span></p></div>
    <div class="column"><p><span>5</span></p></div>
    <div class="column"><p><span>6</span></p></div>
  </div>
  <div class="doubling four column row" id="db_3">
    <div class="column"><p><span>1</span></p></div>
    <div class="column"><p><span>2</span></p></div>
    <div class="column"><p><span>3</span></p></div>
    <div class="column"><p><span>4</span></p></div>
  </div>
</div>

<div class="ui center aligned grid container">
  <div class="ui hidden divider"></div>  
  <h2>Custom visibility (mobile)</h2>
  <div class="ui hidden divider"></div>
</div>

<div class="ui center aligned grid container">
  <div class="widescreen only row">
    <div class="column"><p><span>Widescreen</span></p></div>
  </div>
  <div class="large screen only row">
    <div class="column"><p><span>Large Screen</span></p></div>
  </div>
  <div class="computer only row">
    <div class="column"><p><span>Computer</span></p></div>
  </div>
  <div class="tablet computer only row">
    <div class="column"><p><span>Tablet &amp; Computer</span></p></div>
  </div>
  <div class="two column tablet only row">
    <div class="column"><p><span>Tablet</span></p></div>
    <div class="column"><p><span>Tablet</span></p></div>
  </div>
  <div class="three column mobile only row">
    <div class="column"><p><span>Mobile</span></p></div>
    <div class="column"><p><span>Mobile</span></p></div>
    <div class="column"><p><span>Mobile</span></p></div>
  </div>  
  <div class="three wide mobile six wide tablet twelve wide computer column sixteen wide widescreen column"><p><span>Different width based on screen size</span></p></div>
</div>

<div class="ui divider"></div>


              
            
!

CSS

              
                p {
    align-content: center;    
    background-color: @purple;
    color: #fff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 6em;

    span {
        opacity: 0.4;    
        text-align: center;
    }
}    

// Nested grid visualization
#nested_1,
#nested_2 {
  background-color: rgba(96, 112, 175, .2);
  border: 3px dashed @purple;

  p {
    background-color: @yellow;    
  }
}

#nested_3 {
  background-color: rgba(242, 182, 50, .3);
  border: 3px dashed @yellow;

  p {
    background-color: @white;    
  }
}

// Color variations grid visualization
#color_vars {
  p {
    background-color: @black;
    opacity: 0.1;
  }
}

// Doubling grid visualization
#db_1 {
  p {
    background-color: #db2828;
  }
}
#db_2 {
  p {
    background-color: #fbbd08;
  }
}
#db_3 {
  p {
    background-color: #21ba45;
  }
}

// Semantic UI theme mod styles
.ui {
  .buttons {
    .or { // Buttons sepsarator
      text-transform: none;
      
      &:before {
        background-color: @purple-dark;
        color: @white;        
      }
    }
  }
  // Override division color to make it visible on dark background
  &.divided {
    &.grid {
      &:not([class*="vertically divided"]) {
        > .row {
          > .column {
            box-shadow: -1px 0 0 0 #d4d4d4;
          }        
        }      
      }
    }    
  }
  &[class*="vertically divided"] {
    &.grid {
      > .row {
        &:before {
          box-shadow: 0 -1px 0 0 rgba(212, 212, 212, 1.0);          
        }
      }
    }
  }
}




              
            
!

JS

              
                $('.ui.custom_toggle.buttons .button').click(function(){
  $(this).addClass('active').siblings().removeClass('active')
});

$('#fixed').on('click', function(){
    $('.grid').addClass('container');
});

$('#fluid').on('click', function(){
    $('.grid').removeClass('container');
});
              
            
!
999px

Console