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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                h1.text-center Super awesome flex grid

h2.text-center By default everything is just equally spaced out
.flex-container
  .flex-item.box 1
  .flex-item.box 2
  .flex-item.box 3
  .flex-item.box 4
  .flex-item.box 5

h2.text-center Add class of .flex-wrap and it can break to multiple lines
.flex-container.flex-wrap
  .flex-item.flex-1-3.box .flex-1-3
  .flex-item.flex-1-3.box .flex-1-3
  .flex-item.flex-1-3.box .flex-1-3
  .flex-item.flex-2-3.box .flex-2-3
  .flex-item.flex-1-3.box .flex-1-3

h2.text-center Goes up to a 12 column grid
.flex-container.flex-wrap
  - var n = 1;
  while n <= 12
    .flex-item.flex-1-12.box=n++

h2.text-center anything .flex-1-1 to .flex-12-12 works
.flex-container.flex-wrap
  .flex-item.flex-2-12.box .flex-2-12
  .flex-item.flex-3-12.box .flex-3-12
  .flex-item.flex-4-12.box .flex-4-12
  .flex-item.flex-1-12.box .flex-1-12
  .flex-item.flex-1-12.box .flex-1-12
  .flex-item.flex-1-6.box .flex-1-6
  .flex-item.flex-2-6.box .flex-2-6
  .flex-item.flex-3-6.box .flex-3-6
  .flex-item.flex-1-2.box .flex-1-2
  .flex-item.flex-1-4.box .flex-1-4
  .flex-item.flex-1-4.box .flex-1-4
  .flex-item.flex-3-12.box .flex-3-12
  .flex-item.flex-9-12.box .flex-9-12
  
h2.text-center 
  | add .row to any wrapper to make max-width of 1400px (configurable with variable)
.flex-container.flex-wrap.row
  - var n = 1;
  while n <= 12
    .flex-item.flex-1-12.box=n++
    
h2.text-center can add flex-1-x classes to wrapper to change width of items (this is flex-1-2)
.flex-container.flex-wrap.flex-1-2
  .flex-item.box 
  .flex-item.box
  .flex-item.box
  .flex-item.box
  
h2.text-center can add flex-1-x classes to wrapper to change width of items (this is flex-1-5)
.flex-container.flex-wrap.flex-1-5
  .flex-item.box 
  .flex-item.box
  .flex-item.box
  .flex-item.box
  .flex-item.box
  .flex-item.box
  .flex-item.box
  
h2.text-center can handle responsive classes based on variable breakpoints
h3.text-center (sm-flex-1-1, md-flex-1-2, lg-flex-1-3, xl-flex-1-4, jumbo-flex-1-5)
.flex-container.flex-wrap.flex-1-1.sm-flex-1-1.md-flex-1-2.lg-flex-1-3.xl-flex-1-4.jumbo-flex-1-5
  .flex-item.box 
  .flex-item.box
  .flex-item.box
  .flex-item.box
  .flex-item.box
              
            
!

CSS

              
                html {
  box-sizing: border-box;
  font-size: 16px;

  * {
    box-sizing: inherit;
  }
}

.box {
  width: 100px;
  height: 100px;
  color: white;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.6);
  font-size: 2rem;
  padding: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.text-center {
  text-align: center;
}

$default: 0px;
$sm: 600px;
$md: 900px;
$lg: 1200px;
$xl: 1440px;
$jumbo: 1920px;
$row-width: 1400px;
$inner-row-width: 800px;
$gutter-width: 15px;

.row {
  margin: 0 auto;
  max-width: $row-width;
  padding: 0 $gutter-width;

  @media (min-width: $row-width + $gutter-width) {
    padding: 0;
  }
}

.row-full {
  left: 50%;
  position: relative;
  transform: translateX(-50%);
  width: 100vw;
}

.inner-row {
  margin: 0 auto;
  max-width: $inner-row-width;
  padding: 0 $gutter-width;

  @media (min-width: $inner-row-width + $gutter-width) {
    padding: 0;
  }
}

// I cannot figure out how to get around defining what breakpoints exist for the grid here & in variables.scss
$breakpoints: (
  default: $default,
  sm: $sm,
  md: $md,
  lg: $lg,
  xl: $xl,
  jumbo: $jumbo
);

@each $key, $breakpoint in $breakpoints {
  $beginning: '';
  @if $key != default {
    $beginning: "#{$key}-"; // sass-lint:disable-line space-around-operator
  }

  @media (min-width: $breakpoint) {
    .#{$beginning}flex-container {
      display: flex;
    }

    .#{$beginning}flex-wrap {
      flex-wrap: wrap;
    }

    .#{$beginning}flex-nowrap {
      flex-wrap: nowrap;
    }

    .#{$beginning}flex-wrap-reverse {
      flex-wrap: wrap-reverse;
    }

    .#{$beginning}flex-row,
    .#{$beginning}flex-dir-row {
      flex-direction: row;
    }

    .#{$beginning}flex-dir-row-reverse {
      flex-direction: row-reverse;
    }

    .#{$beginning}flex-column,
    .#{$beginning}flex-dir-column {
      flex-direction: column;
    }

    .#{$beginning}flex-dir-column-reverse {
      flex-direction: column-reverse;
    }

    .#{$beginning}flex-jc-flex-start {
      justify-content: flex-start;
    }

    .#{$beginning}flex-jc-flex-end {
      justify-content: flex-end;
    }

    .#{$beginning}flex-jc-center {
      justify-content: center;
    }

    .#{$beginning}flex-jc-space-between {
      justify-content: space-between;
    }

    .#{$beginning}flex-jc-space-around {
      justify-content: space-around;
    }

    .#{$beginning}flex-jc-space-evenly {
      justify-content: space-evenly;
    }

    .#{$beginning}flex-ai-flex-start {
      align-items: flex-start;
    }

    .#{$beginning}flex-ai-flex-end {
      align-items: flex-end;
    }

    .#{$beginning}flex-ai-center {
      align-items: center;
    }

    .#{$beginning}flex-ai-stretch {
      align-items: stretch;
    }

    .#{$beginning}flex-ai-baseline {
      align-items: baseline;
    }

    .#{$beginning}flex-ac-flex-start {
      align-content: flex-start;
    }

    .#{$beginning}flex-ac-flex-end {
      align-content: flex-end;
    }

    .#{$beginning}flex-ac-center {
      align-content: center;
    }

    .#{$beginning}flex-ac-stretch {
      align-content: stretch;
    }

    .#{$beginning}flex-ac-space-between {
      align-content: space-between;
    }

    .#{$beginning}flex-ac-space-around {
      align-content: space-around;
    }

    .#{$beginning}flex-as-flex-start {
      align-self: flex-start;
    }

    .#{$beginning}flex-as-flex-end {
      align-self: flex-end;
    }

    .#{$beginning}flex-as-center {
      align-self: center;
    }

    .#{$beginning}flex-as-baseline {
      align-self: baseline;
    }

    .#{$beginning}flex-as-stretch {
      align-self: stretch;
    }

    .flex-container > *,
    .flex-item {
      flex: 1 1 100%;
      // on ie11 there is a bug with flex item's padding and box-sizing: border-box, but forcing 0 padding
      // caused other issues like forcing people to use !important tags just to add some padding to flex items.
      padding: 0;

      &.#{$beginning}flex-1-12,
      .#{$beginning}flex-1-12 & {
        flex: 1 1 8.333%;
      }

      &.#{$beginning}flex-1-11,
      .#{$beginning}flex-1-11 & {
        flex: 1 1 9.09%;
      }

      &.#{$beginning}flex-1-10,
      .#{$beginning}flex-1-10 & {
        flex: 1 1 10%;
      }

      &.#{$beginning}flex-1-9,
      .#{$beginning}flex-1-9 & {
        flex: 1 1 11.111%;
      }

      &.#{$beginning}flex-1-8,
      .#{$beginning}flex-1-8 & {
        flex: 1 1 12.5%;
      }

      &.#{$beginning}flex-1-7,
      .#{$beginning}flex-1-7 & {
        flex: 1 1 14.285%;
      }

      &.#{$beginning}flex-1-6,
      &.#{$beginning}flex-2-12,
      .#{$beginning}flex-1-6 & {
        flex: 1 1 16.666%;
      }

      &.#{$beginning}flex-2-11 {
        flex: 1 1 18.181%;
      }

      &.#{$beginning}flex-1-5,
      &.#{$beginning}flex-2-10,
      .#{$beginning}flex-1-5 & {
        flex: 1 1 20%;
      }

      &.#{$beginning}flex-2-9 {
        flex: 1 1 22.222%;
      }

      &.#{$beginning}flex-1-4,
      &.#{$beginning}flex-2-8,
      &.#{$beginning}flex-3-12,
      .#{$beginning}flex-1-4 & {
        flex: 1 1 25%;
      }

      &.#{$beginning}flex-3-11 {
        flex: 1 1 27.272%;
      }

      &.#{$beginning}flex-2-7 {
        flex: 1 1 28.571%;
      }

      &.#{$beginning}flex-3-10 {
        flex: 1 1 30%;
      }

      &.#{$beginning}flex-1-3,
      &.#{$beginning}flex-2-6,
      &.#{$beginning}flex-3-9,
      &.#{$beginning}flex-4-12,
      .#{$beginning}flex-1-3 & {
        flex: 1 1 33.333%;
      }

      &.#{$beginning}flex-4-11 {
        flex: 1 1 36.363%;
      }

      &.#{$beginning}flex-3-8 {
        flex: 1 1 37.5%;
      }

      &.#{$beginning}flex-2-5,
      &.#{$beginning}flex-4-10 {
        flex: 1 1 40%;
      }

      &.#{$beginning}flex-5-12 {
        flex: 1 1 41.666%;
      }

      &.#{$beginning}flex-3-7 {
        flex: 1 1 42.857%;
      }

      &.#{$beginning}flex-4-9 {
        flex: 1 1 44.444%;
      }

      &.#{$beginning}flex-5-11 {
        flex: 1 1 45.454%;
      }

      &.#{$beginning}flex-1-2,
      &.#{$beginning}flex-2-4,
      &.#{$beginning}flex-3-6,
      &.#{$beginning}flex-4-8,
      &.#{$beginning}flex-5-10,
      &.#{$beginning}flex-6-12,
      .#{$beginning}flex-1-2 & {
        flex: 1 1 50%;
      }

      &.#{$beginning}flex-6-11 {
        flex: 1 1 54.545%;
      }

      &.#{$beginning}flex-5-9 {
        flex: 1 1 55.555%;
      }

      &.#{$beginning}flex-4-7 {
        flex: 1 1 57.142%;
      }

      &.#{$beginning}flex-7-12 {
        flex: 1 1 58.333%;
      }

      &.#{$beginning}flex-6-10 {
        flex: 1 1 60%;
      }

      &.#{$beginning}flex-5-8 {
        flex: 1 1 62.5%;
      }

      &.#{$beginning}flex-7-11 {
        flex: 1 1 63.636%;
      }

      &.#{$beginning}flex-2-3,
      &.#{$beginning}flex-3-5,
      &.#{$beginning}flex-4-6,
      &.#{$beginning}flex-6-9,
      &.#{$beginning}flex-8-12 {
        flex: 1 1 66.666%;
      }

      &.#{$beginning}flex-7-10 {
        flex: 1 1 70%;
      }

      &.#{$beginning}flex-5-7 {
        flex: 1 1 71.428%;
      }

      &.#{$beginning}flex-8-11 {
        flex: 1 1 72.727%;
      }

      &.#{$beginning}flex-3-4,
      &.#{$beginning}flex-6-8,
      &.#{$beginning}flex-9-12 {
        flex: 1 1 75%;
      }

      &.#{$beginning}flex-7-9 {
        flex: 1 1 77.777%;
      }

      &.#{$beginning}flex-4-5,
      &.#{$beginning}flex-8-10 {
        flex: 1 1 80%;
      }

      &.#{$beginning}flex-9-11 {
        flex: 1 1 81.818%;
      }

      &.#{$beginning}flex-5-6,
      &.#{$beginning}flex-10-12 {
        flex: 1 1 83.333%;
      }

      &.#{$beginning}flex-6-7 {
        flex: 1 1 85.714%;
      }

      &.#{$beginning}flex-7-8 {
        flex: 1 1 87.5%;
      }

      &.#{$beginning}flex-8-9 {
        flex: 1 1 88.888%;
      }

      &.#{$beginning}flex-9-10 {
        flex: 1 1 90%;
      }

      &.#{$beginning}flex-10-11 {
        flex: 1 1 90.909%;
      }

      &.#{$beginning}flex-11-12 {
        flex: 1 1 91.666%;
      }

      &.#{$beginning}flex-1-1,
      &.#{$beginning}flex-2-2,
      &.#{$beginning}flex-3-3,
      &.#{$beginning}flex-4-4,
      &.#{$beginning}flex-5-5,
      &.#{$beginning}flex-6-6,
      &.#{$beginning}flex-7-7,
      &.#{$beginning}flex-8-8,
      &.#{$beginning}flex-9-9,
      &.#{$beginning}flex-10-10,
      &.#{$beginning}flex-11-11,
      &.#{$beginning}flex-12-12 {
        flex: 1 1 100%;
      }

      &.#{$beginning}flex-shrink-0 {
        flex-shrink: 0;
      }
      
      &.#{$beginning}flex-grow-0 {
        flex-grow: 0;
      }

      &.#{$beginning}flex-grow-2 {
        flex-grow: 2;
      }

      &.#{$beginning}flex-grow-3 {
        flex-grow: 3;
      }

      &.#{$beginning}flex-grow-4 {
        flex-grow: 4;
      }

      &.#{$beginning}flex-grow-5 {
        flex-grow: 5;
      }
    }
  }
}



              
            
!

JS

              
                const randomColor = () => '#'+Math.floor(Math.random()*16777215).toString(16);

let boxes = document.querySelectorAll('.box');

for (let i=0; i<boxes.length; i++) {
  boxes[i].style.background = randomColor();
}
              
            
!
999px

Console