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HTML 

              
                <h1 class="title">Flexible Grid</h1>
	
	<div class="wrapper">
		<div class="box grid1">01</div>
		<div class="box grid2">02</div>
		<div class="box grid3">03</div>
		<div class="box grid4">04</div>
		<div class="box grid5">05</div>
		<div class="box grid6">06</div>
		<div class="box grid7">07</div>
		<div class="box grid8">08</div>
		<div class="box grid9">09</div>
		<div class="box grid10">10</div>
		<div class="box grid11">11</div>
		<div class="box grid12">12</div>
		<div class="box grid13">13</div>
		<div class="box grid14">14</div>
		<div class="box grid15">15</div>
		<div class="box grid16">16</div>

		<div class="box grid17">17</div>
		<div class="box grid18">18</div>
		<div class="box grid19">19</div>
		<div class="box grid20">20</div>
		<div class="box grid21">21</div>
		<div class="box grid22">22</div>
		<div class="box grid23">23</div>
		<div class="box grid24">24</div>	

		<div class="box grid25">25</div>
		<div class="box grid26">26</div>
		<div class="box grid27">27</div>
		<div class="box grid28">28</div>
		<div class="box grid29">29</div>


		<div class="box grid30">30</div>
		<div class="box grid31">31</div>
		<div class="box grid32">32</div>
		<div class="box grid33">33</div>

		
	</div>
!

CSS 

              
                body {
	margin: 0;
	padding: 20px;
	background-color: #999;
	color: #fff;
	background-image: url("http://media.24ways.org/2012/andrew/otis_redding.png");
	font: 87.5%/1.4 HelveticaNeue, "Helvetica Neue", Helvetica, Arial, sans-serif;
}


h1, h2, h3, h4, h5, h6 {
    font-family: "Georgia","Times New Roman",serif;
    font-weight: normal;
    padding: 0;
    margin: 0;
}

h1 {
    font-size: 328.571%;
    margin-bottom: 0.2em;
}

h1.title {
	text-align: center;
	text-shadow: 1px 1px 2px rgba(0,0,0,0.8);
}

h2 {
    font-size: 250%;
    margin-bottom: 0.2em;
}

h3 {
    font-size: 150%;
    margin-bottom: 0.2em;
}

p {
	margin:0;
	padding: 0 0 1em 0;
}

.box {
    background-color: #ddd;
    padding: 10px 10px 1px;
    color: #444;
}


.wrapper {	 
  width: 90%;
  margin: 0 auto 0 auto;
  display:grid;
  grid-template-columns:  (gutter) 1fr repeat(16, (col) 4.25fr (gutter) 1fr );
  grid-template-rows: repeat(9, (row) auto (gutter) 20px );
}


/* this is an example of positioning items on the grid
first row, single column items */
.grid1 { grid-column: col / span 1; grid-row: row / span 1;} 
.grid2 { grid-column: col 2 / span 1; grid-row: row / span 1;} 
.grid3 { grid-column: col 3 / span 1; grid-row: row / span 1;}
.grid4 { grid-column: col 4 / span 1; grid-row: row / span 1;} 
.grid5 { grid-column: col 5 / span 1; grid-row: row / span 1;}
.grid6 { grid-column: col 6 / span 1; grid-row: row / span 1;}
.grid7 { grid-column: col 7 / span 1; grid-row: row / span 1;}
.grid8 { grid-column: col 8 / span 1; grid-row: row / span 1;}
.grid9 { grid-column: col 9 / span 1; grid-row: row / span 1;}
.grid10 { grid-column: col 10 / span 1; grid-row: row / span 1;}
.grid11 { grid-column: col 11 / span 1; grid-row: row / span 1;}
.grid12 { grid-column: col 12 / span 1; grid-row: row / span 1;}
.grid13 { grid-column: col 13 / span 1; grid-row: row / span 1;}
.grid14 { grid-column: col 14 / span 1; grid-row: row / span 1;}
.grid15 { grid-column: col 15 / span 1; grid-row: row / span 1;}
.grid16 { grid-column: col 16 / span 1; grid-row: row / span 1;}

/* second row items span 2 columns and one gutter */
.grid17 { grid-column: col / span gutter 2; grid-row: row 2 / span 1; }
.grid18 { grid-column: col 3 / span gutter 2; grid-row: row 2 / span 1; }
.grid19 { grid-column: col 5 / span gutter 2; grid-row: row 2 / span 1; }
.grid20 { grid-column: col 7 / span gutter 2; grid-row: row 2 / span 1; }
.grid21 { grid-column: col 9 / span gutter 2; grid-row: row 2 / span 1; }
.grid22 { grid-column: col 11 / span gutter 2; grid-row: row 2 / span 1; }
.grid23 { grid-column: col 13 / span gutter 2; grid-row: row 2 / span 1; }
.grid24 { grid-column: col 15 / span gutter 2; grid-row: row 2 / span 1; }

/*
 third row we have 4 items spanning 3 cols and 1 spanning 4 */
.grid25 { grid-column: col / span gutter 3; grid-row: row 3 / span 1; }
.grid26 { grid-column: col 4 / span gutter 3; grid-row: row 3 / span 1; }
.grid27 { grid-column: col 7 / span gutter 3; grid-row: row 3 / span 1; }
.grid28 { grid-column: col 10 / span gutter 3; grid-row: row 3 / span 1;}
.grid29 { grid-column: col 13 / span gutter 4; grid-row: row 3 / span 1; }

/* fourth row 4 items spanning 4 columns each */
.grid30 { grid-column: col / span gutter 4; grid-row: row 4 / span 1; }
.grid31 { grid-column: col 5 / span gutter 4; grid-row: row 4 / span 1;}
.grid32 { grid-column: col 9 / span gutter 4; grid-row: row 4 / span 1; }
.grid33 { grid-column: col 13 / span gutter 4; grid-row: row 4 / span 1; }
!

JS
!
999px

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