I'm designing my first website using Fluid Grid Layouts. CSS question

I'm designing my first website using CS6 and Fluid Grid Layouts so I need a lot of help. I realize CS6 creates something called a boilerplate css file. However, in addition to that file, do I have to create an individual external style sheet for my desktop, ipad, and smart phone pages (3 separate style sheets) or should I have only one external style sheet for everything?
Or this is there another recommended way to use Fluid Grid Layouts?

FluidGrid Layouts creates a boilerplate.css file, a respond.js file & a Fluid.css file for you -- you name it whatever you like.  I like to call mine Fluid.css so I remember what it is. 
Fluid.css contains mobile first -- upon which all others are based.  Inside, CSS Media queries, you'll find code for tablet and later on desktop.  So one stylesheet generated by DW covers all 3.
TIPS: 
FluidGrids are very temperamental.  Do not tamper with boilerplate.css or Fluid.css files.  Instead create a separate external style sheet for your typography & other custom content styles.
Build mobile first, then tablet and finally desktop.
Keep your designs simple and uncluttered. 
Don't worry about content until you get the layout perfected.
Have fun with it .  You'll probably have to start over a few times before you get what you want.
Nancy O.

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    Brian McNay wrote:
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    HTML
    CSS
    <!doctype html>
    <!--[if lt IE 7]> <html class="ie6 oldie"> <![endif]-->
    <!--[if IE 7]>    <html class="ie7 oldie"> <![endif]-->
    <!--[if IE 8]>    <html class="ie8 oldie"> <![endif]-->
    <!--[if gt IE 8]><!-->
    <html class="">
    <!--<![endif]-->
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              margin-right: auto;
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              padding-right: 1.1869%;
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              background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #FFFFFF), color-stop(1, #CAE4BF));
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              float: left;
              margin-left: 0;
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              display: block;
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              clear: both;
              float: left;
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              width: 100%;
              display: block;
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              clear: both;
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              width: 100%;
              display: block;
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              float: left;
              margin-left: 2.6785%;
              width: 100%;
              display: block;
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              clear: none;
              float: left;
              margin-left: 2.6785%;
              width: 100%;
              display: block;
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              clear: both;
              float: left;
              margin-left: 0;
              width: 100%;
              display: block;
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              width: 91.4836%;
              padding-left: 0.7581%;
              padding-right: 0.7581%;
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              clear: both;
              float: left;
              margin-left: 0;
              width: 100%;
              display: block;
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              clear: both;
              float: left;
              margin-left: 0;
              width: 100%;
              display: block;
              height: 100px;
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              clear: none;
              float: left;
              margin-left: 1.6574%;
              width: 100%;
              display: block;
    #ThreeReasonsContainer {
              clear: both;
              float: left;
              margin-left: 0;
              width: 100%;
              display: block;
    /* Desktop Layout: 769px to a max of 1000px.  Inherits styles from: Mobile Layout and Tablet Layout. */
    @media only screen and (min-width: 769px) {
    .gridContainer {
              width: 89.0217%;
              max-width: 1000px;
              padding-left: 0.4891%;
              padding-right: 0.4891%;
              margin: auto;
    #Header {
              clear: both;
              float: left;
              margin-left: 0;
              width: 96%;
              margin: 0px 2% 0px 2%;
              display: block;
              height: 62px;
              /* IE10 Consumer Preview */
              background-image: -ms-linear-gradient(top, #FFFFFF 0%, #CAE4BF 100%);
              /* Mozilla Firefox */
              background-image: -moz-linear-gradient(top, #FFFFFF 0%, #CAE4BF 100%);
              /* Opera */
              background-image: -o-linear-gradient(top, #FFFFFF 0%, #CAE4BF 100%);
              /* Webkit (Safari/Chrome 10) */
              background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #FFFFFF), color-stop(1, #CAE4BF));
              /* Webkit (Chrome 11+) */
              background-image: -webkit-linear-gradient(top, #FFFFFF 0%, #CAE4BF 100%);
              /* W3C Markup, IE10 Release Preview */
              background-image: linear-gradient(to bottom, #FFFFFF 0%, #CAE4BF 100%);
    #MenuBar {
              clear: both;
              float: left;
              margin-left: 0;
              height: 63px;
              width: 100%;
              display: block;
              /* IE10 Consumer Preview */
              background-image: -ms-linear-gradient(top, #87C872 0%, #72B35A 100%);
              /* Mozilla Firefox */
              background-image: -moz-linear-gradient(top, #87C872 0%, #72B35A 100%);
              /* Opera */
              background-image: -o-linear-gradient(top, #87C872 0%, #72B35A 100%);
              /* Webkit (Safari/Chrome 10) */
              background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #87C872), color-stop(1, #72B35A));
              /* Webkit (Chrome 11+) */
              background-image: -webkit-linear-gradient(top, #87C872 0%, #72B35A 100%);
              /* W3C Markup, IE10 Release Preview */
              background-image: linear-gradient(to bottom, #87C872 0%, #72B35A 100%);
              z-index: 3;
    #MainImage {
              clear: both;
              float: left;
              margin-left: 0;
              width: 100%;
              display: block;
    #ThreeReasons {
              clear: both;
              float: left;
              margin-left: 0;
              width: 29.3%;
              display: block;
              margin: 0px 2% 0px 2%;
    #ThreeReasons2 {
              clear: none;
              float: left;
              margin-left: 1.0989%;
              width: 100%;
              width: 29.3%;
              display: block;
              margin: 0px 2% 0px 2%;
    #ThreeReasons3 {
              clear: none;
              float: left;
              margin-left: 1.0989%;
              width: 100%;
              width: 29.3%;
              display: block;
              margin: 0px 2% 0px 2%;
    #ThreeReasonsContainer {
              clear: both;
              float: left;
              margin-left: 0;
              width: 96%;
              display: block;
              margin: 0px 2% 0px 2%;
              padding: 10px 0px 10px 0px;
              /* IE10 Consumer Preview */
              background-image: -ms-linear-gradient(top, #CAE4BF 0%, #FFFFFF 100%);
              /* Mozilla Firefox */
              background-image: -moz-linear-gradient(top, #CAE4BF 0%, #FFFFFF 100%);
              /* Opera */
              background-image: -o-linear-gradient(top, #CAE4BF 0%, #FFFFFF 100%);
              /* Webkit (Safari/Chrome 10) */
              background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #CAE4BF), color-stop(1, #FFFFFF));
              /* Webkit (Chrome 11+) */
              background-image: -webkit-linear-gradient(top, #CAE4BF 0%, #FFFFFF 100%);
              /* W3C Markup, IE10 Release Preview */
              background-image: linear-gradient(to bottom, #CAE4BF 0%, #FFFFFF 100%);
              z-index: 2;
    Picture:

    Try
    <!doctype html>
    <html>
    <head>
    <meta charset="utf-8">
    <title>Untitled Document</title>
    <style>
    body {
        width: 1000px;
        margin: auto;
        background: #616161;
    .header {
        height: 70px;
        width: 900px;
        margin: auto;
        background: #D3E8CA;
    .nav {
        height: 90px;
        background: #7CBD66;
      -moz-box-shadow:    0px 0px 5px 3px #333;
      -webkit-box-shadow: 0px 0px 5px 3px #333;
      box-shadow:         0px 0px 5px 3px #333;
        position: relative;
        z-index: 99;
    .content {
        height: 70px;
        width: 900px;
        margin: auto;
        background: #D3E8CA;
    </style>
    </head>
    <body>
    <div class="header"></div>
    <div class="nav"></div>
    <div class="content"></div>
    </body>
    </html>

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