/* -----------------------------------------
	Responsive Starter Template
   ----------------------------------------- */

/* Reset & Base
================================================================================================= */
html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline; 
}
article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section {display: block;}
body {line-height: 1;}
ol, ul {list-style: none;}
blockquote, q {quotes: none;}
blockquote:before, blockquote:after,q:before, q:after {content: ''; content: none;}
table {border-collapse: collapse; border-spacing: 0;}
figure {margin: 0}
img, object, embed, video {max-width: 100%;	_width: 100%} /* Fluid images */
img {border: 0;	-ms-interpolation-mode: bicubic; height: auto;} /* Improve IE's resizing of images */
svg:not(:root) {overflow: hidden} /* Correct IE9 overflow */


/* Links (No outline borders) 
============================================================================================== */
a{text-decoration: none;}
a:hover, a:active {outline: 0;}


/* #Containers
================================================================================================= */
.fixed-container {
	width:1024px;
	margin: 0 auto;
	display: block;
}

.container {
	width: 100%;
	margin: 0 auto;
	padding: 0 20px;
	display: block;
}

/* #Colummns
================================================================================================= */
.one-unit, .two-units, .three-units, .four-units, .five-units, .six-units, .seven-units, .eight-units, .nine-units, .ten-units, .eleven-units, .twelve-units {
	float: left;
	position: relative;
	margin-left: 1%;
	margin-right: 1%;
}

/* #Grid 12 Colummns
================================================================================================= */
.one-unit      {width:6.333%;}
.two-units     {width:14.667%;}
.three-units   {width:23.0%;}
.four-units    {width:31.333%;}
.five-units    {width:39.667%;}
.six-units     {width:48.0%;}
.seven-units   {width:56.333%;}
.eight-units   {width:64.667%;}
.nine-units	   {width:73.0%;}
.ten-units     {width:81.333%;}
.eleven-units  {width:89.667%;}
.twelve-units  {width:98.0%;}

/* #Clear Margin left and right
================================================================================================= */
.first {margin-left: 0;}
.last {margin-right: 0;}



/* Responsive Navigation Basic Style 
----------------------------------------------------------------------------------------------------*/
nav ul {list-style: none;}
nav li {display: inline-block;}
nav a {display: inline-block;}
nav select {display: none;}
    
    
/* Clear 
----------------------------------------------------------------------------------------------------*/
.cf:before, .cf:after {content:""; display:table;}
.cf:after {clear:both;}
.cf {zoom:1;}


/* General small screen Mobile 
============================================================================================== */
body {
font-size: 1.0em;
-webkit-text-size-adjust: none;
-ms-text-size-adjust: none;
}

.fixed-container,.container {
width: 100%;
min-width: 0;
margin-left: 0px;
margin-right: 0px;
padding-left: 0px;
padding-right: 0px;
}

.one-unit, .two-units, .three-units, .four-units, .five-units, .six-units, .seven-units, .eight-units, .nine-units, .ten-units, .eleven-units, .twelve-units {
{
width: auto;
float: none;
margin-left: 10px;
margin-right: 10px;
padding-left: 10px;
padding-right: 10px;
}


/* #MEDIA QUERIES - Progressively Enhance With Mobile First
============================================================================================== */
@media screen and (min-width: 320px) {
 /* Add your styles for devices with a maximum width of 320 */
}

@media screen and (min-width: 480px) {
 /* Add your styles for devices with a maximum width of 480 */
}

@media screen and (min-width: 768px) {
 /* GRID FOR DESKTOPS */
/* #Containers
================================================================================================= */
.fixed-container {
	width:1024px;
	margin: 0 auto;
	display: block;
}

.container {
	width: 100%;
	margin: 0 auto;
	padding: 0 20px;
	display: block;
}

/* #Colummns
================================================================================================= */
.one-unit, .two-units, .three-units, .four-units, .five-units, .six-units, .seven-units, .eight-units, .nine-units, .ten-units, .eleven-units, .twelve-units {
	float: left;
	position: relative;
	margin-left: 1%;
	margin-right: 1%;
}

/* #Grid 12 Colummns
================================================================================================= */
.one-unit      {width:6.333%;}
.two-units     {width:14.667%;}
.three-units   {width:23.0%;}
.four-units    {width:31.333%;}
.five-units    {width:39.667%;}
.six-units     {width:48.0%;}
.seven-units   {width:56.333%;}
.eight-units   {width:64.667%;}
.nine-units	   {width:73.0%;}
.ten-units     {width:81.333%;}
.eleven-units  {width:89.667%;}
.twelve-units  {width:98.0%;}
}

@media screen and (min-width: 1024px) {
 /* Add your styles for devices with a maximum width of 1024 */
}

/* iPads (landscape) ----------- */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : landscape) {
   /* Add your styles for devices with a maximum width of 1024 */
}
/* iPads (portrait) ----------- */
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) and (orientation : portrait) {
  /* Add your styles for devices with a maximum width of 768 */
}

Took bits and pieces of Responsive Boilerplate, using mobile first and progressively enhanced ideology to make a solid starting point for Responsive Design.

Responsive Design Starter CSS

css, template, design

CSS