My CSS 3 Flex Box

Own brewed less stylesheet with the use of flex-box .u-box class. My css class explanations.

The use of .u-box and .u-box-flex to create a structure.

Flex Box

<style type="text/less">  
    /**
     ** mixins 
     **/

    .flex() {
        display: -webkit-box;      /* OLD - iOS 6-, Safari 3.1-6 */
        display: -moz-box;         /* OLD - Firefox 19- (buggy but mostly works) */
        display: -ms-flexbox;      /* TWEENER - IE 10 */
        display: -webkit-flex;     /* NEW - Chrome */
        display: flex;             /* NEW, Spec - Opera 12.1, Firefox 20+ */
    }

    .flex--column() {
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
        -webkit-flex-direction: column;
          -ms-flex-direction: column;
            flex-direction: column;
    }

    .flex--row() {
        -webkit-box-orient: horizontal;
        -webkit-box-direction: normal;
        -webkit-flex-direction: row;
          -ms-flex-direction: row;
            flex-direction: row;
    }

    .flex--align-center() {
        align-items: center;
    }

    .flex-flex(@flex: 1) {
        -webkit-box-flex: @flex;      /* OLD - iOS 6-, Safari 3.1-6 */
        -moz-box-flex: @flex;         /* OLD - Firefox 19- */
        -webkit-flex: @flex;          /* Chrome */
        -ms-flex: @flex;              /* IE 10 */
        flex: @flex;    
    }

    .flex-content(@content) {
        -webkit-justify-content: @content;
        -ms-flex-pack: @content;
        justify-content: @content;
    }

    /* END mixins */




    /** 
     ** utils 
     **/ 

    .u-box {
        .flex();

        /*
         * Flex Direction: COLUMN - Where elements goes from TOP to BOTTOM
         */
        &--column {
            .flex--column();
        }

        /*
         * Flex Direction: ROW - Where elements goes from LEFT to RIGHT
         */
        &--row {
            .flex--row();
        }

        // flex-wrap on default `nowrap` where items is inline
        &--wrap {
            flex-wrap: wrap;
        }
        &--wrap-reverse {
            flex-wrap: wrap-reverse;
        }

        &--list {
            margin-right: -1rem;
            margin-bottom: -1rem;

            > * {
                margin-right: 1rem;
                margin-bottom: 1rem;

                &:empty {
                    display: none;
                }
            }
        }

        /* 
         * Justify content HORIZONTALLY - left/right/row
         */
        &--justify {
            &-flex-start {
                justify-content: flex-start;
            }
            &-flex-end {
                justify-content: flex-end;
            }
            &-center {
                justify-content: center;
            }
            &-space-between {
                justify-content: space-between;
            }
            &-space-around {
                justify-content: space-around;
            }
        }

        &--inline {
            display: inline-flex;
        }

        /* 
         *  Align content VERTICALLY - up/down/column 
         */

        &--align {
            &-flex-start {
                align-items: flex-start;
            }
            &-flex-end {
                align-items: flex-end;
            }
            &-center {
                align-items: center;
            }
            &-stretch {
                align-items: stretch;
            }
            &-space-between {
                align-items: space-between;
            }
            &-space-around {
                align-items: space-around;
            }
        }


        &--align-center {
            -webkit-align-items: center; /* Safari 7.0+ */
            align-items: center;
        }

        &--flex-end {
            -webkit-justify-content: flex-end;
            justify-content: flex-end;
        }

        &--queries {
            .flex--column();
        }
    }


    .u-box-flex {
        .flex-flex(1);

        &--minWidth {
            flex-basis: 320px;
        }

        &--grow {
            flex-grow: 1;
        }

        &--shrink {
            flex-shrink: 0;
        }
    }
</style>  
<script src="//cdnjs.cloudflare.com/ajax/libs/less.js/2.7.1/less.min.js"></script>  

Make sure css have this

body {  
  margin: 0;
  min-height: 100vh;
}

if browser don't support 100vh. Use Chrome. No really I don't make outdated browser hacks for MSIE anymore.

Initiate platform

Ground zero

Main box
Main box

Make parent (<body/>) element with .u-box so the rest will fill to the bottom

Main box .u-box-flex

Give the main box a .u-box-flex class, so it fills to the right

Building elements

Main box in place

Let’s make a <header/><main/><footer/>.

header
main content here
footer

Ideally we want to have <footer/> on the bottom of the page. We can do it with position: fixed or position: absolute, but there’s no need. To do that we want to fill the main content not with elements but with .u-box-flex

header
main content here with .u-box-flex
footer

As you can see it doesn't fill up. Means we need to put .u-box on it's parent.

header
main content here with .u-box-flex
footer

Since display: flex default direction is a row we need to modify the direction as column: flex-direction: column.
Now let’s put extra modifier next to .u-box to .u-box.u-box--column.

header
main content here with .u-box-flex
footer

.u-box--column is added after u-box.

Main element with text

header
footer

Usually this structure is enough to start with

Now we can put the normal <div/> in it and add some text.

header

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footer

I put extra child element <div class="main-content" /> inside <main/>

header

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footer

I gave <div class="main-content" /> with some style: max-width: 320px; margin: 0 auto

Main element with Flex Box child elements

header
footer

Basic structure

Let’s put <div class="main-content" /> in a wrapper called <main/>.

header

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footer

It would be nice to have a navigational sidebar

header

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footer

Made a <nav/> sibling of <main/>

 - <body/>
   - <header/>
   - <main/>
     - <main/>
     - <nav/>
   - <footer/>

Let’s give the parent of those siblings a .u-box. Remember display: flex default direction is row.

header

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footer

Put .u-box in the parent element of these siblings <main/><nav/> which is <main />

Of course we want to fill the remaining space. Let's do that with .u-box-flex.

header

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footer

To fill the space with: .u-box-flex. Just like <main class="u-box-flex"/><nav/>.

For SEO stuff we keep in mind that <main/> element should be first before <nav/> sidebar in this markup.
We can change the order how we put our siblings. So we switch <nav/> element order just with styling order: -1;

header

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footer

<nav/> with Flex Box styling order: -1 to change.

Optionally you can add extra sibling for another sidebar <aside/> for example ads content.

header

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footer

Final styling

We’re going to give sidebars width 120px, not like: width: 120px but with flex-grow: 0; flex-shrink: 0; flex-basis: 120px. That’s shorthand for flex: 0 0 120px;
Therefore I made a LESS function for multi browser goals: .flex-flex(@flex: 1);

This is very useful if you want to change flex directions from Row to Column.

  .flex-flex(@flex: 1) {
    -webkit-box-flex: @flex;      /* OLD - iOS 6-, Safari 3.1-6 */
    -moz-box-flex: @flex;         /* OLD - Firefox 19- */
    -webkit-flex: @flex;          /* Chrome */
    -ms-flex: @flex;              /* IE 10 */
    flex: @flex;    
  }

  .sidebar {
    .flex-flex(0 0 120px)
  }
header

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footer

Media Queries

Remember that we have that three siblings <main/><nav/><aside/> that has a parent <main/> that uses .u-box. We can add extra modifier, for example: .u-box.u-box--queries. So you can use @media() {} to change flex-box direction to column.

.flex--row() {
      -webkit-box-orient: horizontal;
   -webkit-box-direction: normal;
  -webkit-flex-direction: row;
      -ms-flex-direction: row;
          flex-direction: row;
}

.flex--column() {
      -webkit-box-orient: vertical;
   -webkit-box-direction: normal;
  -webkit-flex-direction: column;
      -ms-flex-direction: column;
          flex-direction: column;
}

.u-box.u-box--queries {
  .flex--column();
}

@media (min-width: 768px) {
  .u-box.u-box--queries {
    .flex--row();
  }
  .sidebar {
    .flex-flex(0 0 120px)
  }
}

Make sure you move .sidebar class inside that media query.

On a mobile version should look like this

header

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footer

When the screen reach above particular width, this case min-width: 768px:

header

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footer
html  
  body.u-box-flex.u-box.u-box--column
    header(style='background-color: #646065; color: navajowhite') header
    main.u-box-flex.u-box.u-box--queries(style='background-color: navajowhite;')
      main.u-box-flex(style='background-color: gold')
        .main-content(style='max-width: 320px; margin: 0 auto')
          p
            | Blog fap chia banjo, sriracha beard wolf chambray waistcoat leggings food truck aesthetic narwhal taxidermy. Intelligentsia sustainable fixie, occupy locavore kinfolk aesthetic scenester fingerstache. Pour-over keffiyeh PBR&B tousled, hashtag
            | DIY single-origin coffee lumbersexual godard tote bag post-ironic YOLO. Blog letterpress deep v tilde chicharrones. Echo park taxidermy hella, pug hammock scenester intelligentsia 8-bit drinking vinegar portland godard tofu jean shorts +1 chambray.
            | Portland stumptown PBR&B, flexitarian gastropub schlitz forage tote bag. Waistcoat dreamcatcher shoreditch, art party echo park leggings kombucha everyday carry post-ironic salvia intelligentsia pitchfork slow-carb blue bottle ethical.
      nav.sidebar(style='order: -1; background-color: cadetblue; color: aliceblue')
        ul.nav-sidebar.u-list
          li Main
          li Profile
          li About
          li Contact
      aside.sidebar(style='background-color: cadetblue; color: aliceblue')
        .ads Ads
        .ads Ads
        .ads Ads
    footer(style='background-color: #646065; color: navajowhite') footer

Still hating Jade script. I just use the converter

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