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CSS

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HTML 

              
                <html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Flexbox responsive grid</title>
</head>
<body>
  <div class="wrapper">
    <p>Responsive grid with Flexbox</p>
  <h1>Basic Grid</h1>
    <p></p>
  <div class="Grid Grid--full u-textCenter">
    <div class="Grid-cell"><div class="Demo content-1of1"></div></div>
  </div>
  <div class="Grid Grid--gutters Grid--cols-2 u-textCenter">
    <div class="Grid-cell"><div class="Demo content-1of2"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of2"></div></div>
  </div>
  <div class="Grid Grid--gutters Grid--cols-3 u-textCenter">
    <div class="Grid-cell"><div class="Demo content-1of3"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of3"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of3"></div></div>
  </div>
  <div class="Grid Grid--gutters Grid--cols-4 u-textCenter">
    <div class="Grid-cell"><div class="Demo content-1of4"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of4"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of4"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of4"></div></div>
  </div>
  <div class="Grid Grid--gutters Grid--cols-6 u-textCenter">
    <div class="Grid-cell"><div class="Demo content-1of6"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of6"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of6"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of6"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of6"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of6"></div></div>
  </div>
    
  <div class="Grid Grid--gutters Grid--cols-12 u-textCenter">
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
    <div class="Grid-cell"><div class="Demo content-1of12"></div></div>
  </div>  
  <hr />  
    
  <h1>Sidebar and main content</h1>
  <div class="Grid Grid--gutters Grid--1of6">
    <div class="Grid-cell"><div class="Demo content-1of6"></div></div>
    <div class="Grid-cell"><div class="Demo">auto</div></div>
  </div>
  <div class="Grid Grid--gutters Grid--1of4">
    <div class="Grid-cell"><div class="Demo content-1of4"></div></div>
    <div class="Grid-cell"><div class="Demo">auto</div></div>
  </div>
  <div class="Grid Grid--gutters Grid--1of3">
    <div class="Grid-cell"><div class="Demo content-1of3"></div></div>
    <div class="Grid-cell"><div class="Demo">auto</div></div>
  </div> 
  <hr /> 
    
  <h1>Left / Center / Right content alignment</h1>
  <div class="Grid Grid--gutters Grid--1of2">
    <div class="Grid-cell"><div class="Demo content-1of2"></div></div>
  </div>

  <div class="Grid Grid--gutters Grid--1of2 Grid--center">
    <div class="Grid-cell"><div class="Demo content-1of2"></div></div>
  </div>
    
  <div class="Grid Grid--gutters Grid--1of2 Grid--right">
    <div class="Grid-cell"><div class="Demo content-1of2"></div></div>
  </div>
  <hr />   
    
 <h1>Nesting</h1>
  <div class="Grid Grid--gutters Grid--1of3 Grid--nested">
    <div class="Grid-cell"><div class="Demo content-1of3"></div></div>
    <div class="Grid-cell"><div class="Demo">     
      <div class="Grid Grid--gutters Grid--1of3 Grid--nested">
        <div class="Grid-cell"><div class="Demo content-1of3"></div></div>
        <div class="Grid-cell"><div class="Demo">
          <div class="Grid Grid--gutters Grid--1of3 Grid--nested">
            <div class="Grid-cell"><div class="Demo content-1of3"></div></div>
            <div class="Grid-cell"><div class="Demo">auto</div></div>
          </div>        
        </div></div>
      </div>      
    </div>
    </div>
  </div>
  <hr /> 
    
  <h1>Vertical alignment</h1>
  <div class="Grid Grid--gutters Grid--cols-3 Grid--top">
    <div class="Grid-cell"><div class="Demo">This cell should be <strong>top-aligned</strong>.</div></div>
    <div class="Grid-cell"><div class="Demo">Vice keytar actually DIY Thundercats. Flannel heirloom lo-fi Blue Bottle Intelligentsia pour-over Etsy church-key banh mi Marfa lomo yr messenger bag.Artisan try-hard food truck +1 Cosby sweater.</div></div>
    <div class="Grid-cell"><div class="Demo">Letterpress YOLO Austin Pinterest Helvetica. Cliche pug literally, church-key 90's twee you probably haven't heard of them meh fixie cornhole banh mi pork belly mustache. Stumptown bespoke Vice, bitters sustainable hoodie Echo Park letterpress 8-bit pug. Quinoa meh flexitarian roof party, actually selvage Carles put a bird on it umami vegan ethical. </div></div>
  </div>
  <div class="Grid Grid--gutters Grid--cols-3 Grid--center">
    <div class="Grid-cell"><div class="Demo">This cell should be <strong>center-aligned</strong>.</div></div>
    <div class="Grid-cell"><div class="Demo">Vice keytar actually DIY Thundercats. Flannel heirloom lo-fi Blue Bottle Intelligentsia pour-over Etsy church-key banh mi Marfa lomo yr messenger bag.Artisan try-hard food truck +1 Cosby sweater.</div></div>
    <div class="Grid-cell"><div class="Demo">Letterpress YOLO Austin Pinterest Helvetica. Cliche pug literally, church-key 90's twee you probably haven't heard of them meh fixie cornhole banh mi pork belly mustache. Stumptown bespoke Vice, bitters sustainable hoodie Echo Park letterpress 8-bit pug. Quinoa meh flexitarian roof party, actually selvage Carles put a bird on it umami vegan ethical. </div></div>
  </div>
    
  <div class="Grid Grid--gutters Grid--cols-3 Grid--bottom">
   <div class="Grid-cell"><div class="Demo">This cell should be <strong>bottom-aligned</strong>.</div></div>
    <div class="Grid-cell"><div class="Demo">Vice keytar actually DIY Thundercats. Flannel heirloom lo-fi Blue Bottle Intelligentsia pour-over Etsy church-key banh mi Marfa lomo yr messenger bag.Artisan try-hard food truck +1 Cosby sweater.</div></div>
    <div class="Grid-cell"><div class="Demo">Letterpress YOLO Austin Pinterest Helvetica. Cliche pug literally, church-key 90's twee you probably haven't heard of them meh fixie cornhole banh mi pork belly mustache. Stumptown bespoke Vice, bitters sustainable hoodie Echo Park letterpress 8-bit pug. Quinoa meh flexitarian roof party, actually selvage Carles put a bird on it umami vegan ethical. </div></div>
  </div>
   <hr />  
 
    
   <h1>Holly Grail page layout</h1>   
    <p>Note: in responsive view Aside 1 and Aside 2 elements stack below the Main content.</p>
  <div class="Grid Grid--full Grid--nested header">
    <div class="Grid-cell"><div class="Demo Holly">
      <img src="http://placehold.it/100x50/CC99CC/ffffff&text=Logo" style="vertical-align: middle;"><strong> Header / Logo</strong>
    </div></div>   
  </div>
    
    
  <div class="Grid Grid--full">
    <div class="Grid-cell">
      <ul class="navigation">
      <li><a href="#">Home</a></li>
      <li><a href="#">About</a></li>
      <li><a href="#">Products</a></li>
      <li><a href="#">Contact</a></li>
    </ul>
    </div>
  </div>  
 
  <div class="Grid Grid--gutters Grid--holly-grail">
    <div class="Grid-cell main">
      <div class="Demo Holly">
        <strong>Main</strong>
        <p>Salvia Helvetica ethical lo-fi, artisan messenger bag put a bird on it. Photo booth taxidermy kale chips, Carles Thundercats retro blog paleo. 8-bit four loko jean shorts, church-key tattooed bespoke normcore art party salvia organic vinyl letterpress distillery. You probably haven't heard of them tofu food truck, Echo Park salvia Schlitz heirloom scenester ennui biodiesel Intelligentsia +1 church-key. Bitters meh actually quinoa, YOLO pug authentic. Kitsch health goth paleo, pop-up tofu authentic gluten-free whatever yr Brooklyn irony. Banjo Tumblr you probably haven't heard of them literally aesthetic, wolf put a bird on it Kickstarter yr.</p>
      </div>
    </div>
    <div class="Grid-cell aside aside-1">
      <div class="Demo Holly"><strong>Aside 1</strong><br />
        <div class="img-placeholder"></div>
        
        Chocolate cake fruitcake icing muffin applicake chocolate.
      </div>
    </div>
    <div class="Grid-cell aside aside-2">
      <div class="Demo Holly">
        <strong>Aside 2</strong>
        <p>Hashtag deep v PBR, chillwave banjo mlkshk readymade fixie crucifix. Tattooed Tumblr direct trade trust fund swag gluten-free.</p>
      </div>
    </div>
  </div>  
  
  <div class="Grid Grid--full">
    <div class="Grid-cell"><div class="Demo Holly"><strong>Footer</strong><br /> Copyright &copy; Jelly-o apple pie pie chocolatebar.com</div></div>
  </div>
    <hr />
    <p>Some ideas are borrowed from Phillip Walton's Solved by Flexbox project. </p>
    <br />
 </div>
</body>
</html>
!

CSS 

              
                @import "compass/css3";

// VARIALBLES
// Demo colors:
$demoMain: rgba(51, 153, 204,.2);
$demoMainDark: rgba(51, 153, 204,.6);
$demoBorder: #33cccc;
$demoHolly: rgba(102, 51, 255, 0.1);
$demoHollyDark: rgba(102, 51, 255, 0.25);


body {
  color: #404040;
  font: 100 1em/150% "proxima-nova", Helvetica, sans-serif;
}

.wrapper{
  max-width: 1200px;
  margin: auto;
  //border: 1px solid red;
}

h1, h2, h3, h4 {  
  font-weight: 900;
  color: #333;
  margin: 1.5em 0 0.5em;
}

h1 {font-size: 2em;}
h2 {font-size: 1.8em;}
h3 {font-size: 1.5em;}
h4 {font-size: 1.3em;}

strong {font-weight: 600;}

hr {
    border: none;
    height: 1px;
    background-color: $demoMain;
}

.img-placeholder {
  background-image: url("http://placehold.it/200x100/CC99CC/ffffff&text=Feature");
  background-size: cover;
  min-height: 100px;  // need to specify min-height and min-width
  min-width: 100px;  
}

/*Basic Grid Styles*/
.Grid {
  display: flex;
  flex-flow: row; 
  flex-wrap: wrap;
}
.u-textCenter {
 text-align: center;
}
.Grid-cell {
  flex: 1;
}

.Demo {
  padding: .8em 1em 0;
  margin-bottom: 1em;
  background: $demoMain;
  transition: background-color 0.3s ease;
  border: 1px solid $demoBorder;
  border-radius: 3px;
  &:after {
    content: "";
    display: block;
    margin-top: .8em;
    height: 1px;
   }
  &:hover {
    background: $demoMainDark;
  }
}

.Demo.Holly {
    background: $demoHolly;
    &:hover {
      background: $demoHollyDark;
    }
  }



// Grid Style Modifiers

/* With gutters*/
$gutter: 1em;
.Grid--gutters {
  margin-left: -$gutter;
  .Grid-cell {
    padding-left: $gutter;
  }
  .Grid--nested {
    .Grid-cell:first-of-type {
      .Demo {
        margin-right: 1em;
      }
    }
  }  
}




/* Justify per row*/
.Grid--right {
  justify-content: flex-end;
}
.Grid--center {
  justify-content: center;
}
 
/* Alignment per row */
.Grid--top {
  align-items: flex-start;
}
.Grid--bottom {
  align-items: flex-end;
}
.Grid--center {
  align-items: center;
}

/* Alignment per cell */
.Grid-cell--top {
  align-self: flex-start;
}
.Grid-cell--bottom {
  align-self: flex-end;
}
.Grid-cell--center {
  align-self: center;
}

// Menu
.navigation {
  list-style: none;  
  /*background: deepskyblue;*/
  background: $demoHolly;
  margin: 0 0 1em;
  border: 1px solid $demoBorder;
  border-radius: 3px;

  display: flex;
  
  -webkit-flex-flow: row wrap;
  justify-content: flex-end;
    a {
      text-decoration: none;
      display: block;
      padding: 1em;
      color: #333;
      &:hover {
        background: darken($demoHolly, 10%);
        border-radius:3px;
      }
    }
  &:hover {
    background: $demoHollyDark;
  }
}

@media all and (max-width: 800px) {
  .navigation {
    justify-content: space-around;
  }
}
 
@media all and (max-width: 600px) {
  .navigation {
    -webkit-flex-flow: column wrap;
    flex-flow: column wrap;
    padding: 0;
    a { 
      text-align: center; 
      padding: 10px;
      border-top: 1px solid rgba(255,255,255,0.3); 
      border-bottom: 1px solid rgba(0,0,0,0.1); 
    } 
    li:last-of-type a {
      border-bottom: none;
    }
  }   
}


/*===========================================*/
/* Base classes for all media - Mobile first */
.Grid--cols-2 > .Grid-cell {
  flex: 0 0 100%; 
}

.Grid--cols-3 > .Grid-cell {
  flex: 0 0 100%; 
}

.Grid--cols-4 > .Grid-cell {
  flex: 0 0 100%;
}

.Grid--cols-6 > .Grid-cell {
  flex: 0 0 calc(50% - #{$gutter}); 
}

.Grid--cols-12 > .Grid-cell {
  flex: 0 0 calc(33.3333% - #{$gutter}); 
}

.Grid--holly-grail {
  .aside, .main {
    flex: 1 100%;
  }
}

/* One of -- columns*/
.Grid--1of2 > .Grid-cell,
.Grid--1of4 > .Grid-cell:first-of-type,
.Grid--1of3 > .Grid-cell:first-of-type{
  flex: 0 0 100%;
}
.Grid--1of6 > .Grid-cell:first-of-type {
  flex: 0 0 50%;
}

.Grid--fit > .Grid-cell {
  flex: 1;
}
.Grid--full > .Grid-cell {
  flex: 0 0 100%;
}

/* Tablet (medium) screens */
@media (min-width: 30em) {
  .Grid--cols-4 > .Grid-cell {
    flex: 0 0 calc(50% - #{$gutter});     
  }
  .Grid--cols-6 > .Grid-cell {
    flex: 0 0 calc(33.3333% - #{$gutter});  
  }
  .Grid--cols-12 > .Grid-cell {
    flex: 0 0 calc(16.6666% - #{$gutter});  
  }
  .Grid--holly-grail {
    .aside {
      flex: 1 calc(25% - #{$gutter});
    }
  }
  .Grid--1of2 > .Grid-cell {
    flex: 0 0 50%;
  }
  .Grid--1of6 > .Grid-cell:first-of-type {
    flex: 0 0 30%;
  }
  .Grid--1of4 > .Grid-cell:first-of-type {
    flex: 0 0 50%;
  }
  .Grid--1of3 > .Grid-cell:first-of-type {
    flex: 0 0 100%;
  }
}

/* Large screens */
@media (min-width: 48em) {
  .Grid--cols-2 > .Grid-cell,
  .Grid--cols-3 > .Grid-cell,
  .Grid--cols-4 > .Grid-cell,
  .Grid--cols-6 > .Grid-cell,
  .Grid--cols-12 > .Grid-cell{
    flex: 1;  
  }
  .Grid--holly-grail {
    .main    { flex: 2; }
    .aside   { flex: 1; }
    .aside-1 { order: 1; } 
    .main    { order: 2; }
    .aside-2 { order: 3; }
  }
  .Grid--1of2 > .Grid-cell {
    flex: 0 0 50%;
  }
  .Grid--1of6 > .Grid-cell:first-of-type {
    flex: 0 0 16.6666%;
  }
  .Grid--1of4 > .Grid-cell:first-of-type {
    flex: 0 0 25%;
  }
  .Grid--1of3 > .Grid-cell:first-of-type {
    flex: 0 0 30%;
  }
  .Grid--gutters.Grid--nested {
    .Grid-cell:first-of-type {
      .Demo {
        margin-right: 0;
      }
    }
  }
}
  
// Contents classes
.content-1of1::before { content: "1"; }
.content-1of2::before { content: "1/2"; }
.content-1of3::before { content: "1/3"; }
.content-1of4::before { content: "1/4"; }
.content-1of6::before { content: "1/6"; }
.content-1of12::before { content: "1/12"; }
!

JS
!
999px

Console