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HTML

              
                
<!DOCTYPE html>
<html>
<head>
<style>/* Stylesheet 1: */
body {
    font: 100% Lucida Sans, Verdana;
    margin: 20px;
    line-height: 26px;
}

.container {
    xmin-width: 900px;
}

.wrapper {
    position: relative;
    overflow: auto;
}

#top, #sidebar, #bottom, .menuitem {
    border-radius: 4px;
    margin: 4px;
}

#top {
    background-color: #4CAF50;
    color: #ffffff;
    padding: 15px;
}

#menubar {
    width: 200px;
    float: left
}

#main {
    padding: 10px;
    margin: 0 210px;
}

#sidebar {
    background-color: #32a4e7;
    color: #ffffff;
    padding: 10px;
    width: 180px;
    bottom: 0;
    top: 0;
    right: 0;
    position: absolute;
}

#bottom {
    border: 1px solid #d4d4d4;
    background-color: #f1f1f1;
    text-align: center;
    padding: 10px;
    font-size: 70%;
    line-height: 14px;
}

#top h1, #top p, #menulist {
    margin: 0;
    padding: 0;
}

.menuitem {
    background-color: #f1f1f1;
    border: 1px solid #d4d4d4;
    list-style-type: none;
    padding: 2px;
    cursor: pointer;
}

.menuitem:hover {
    background-color: #ffffff;
}

.menuitem:first-child {
   background-color:#4CAF50;
   color: white;
   font-weight:bold;
}

a {
    color: #000000;
    text-decoration: underline;
}

a:hover {
    text-decoration: none;
}


@media (max-width: 800px) {
    #sidebar {
        width: auto;
        position: relative;
    } 
    #main {
        margin-right: 0;
    }    
       
}

@media (max-width: 600px) {
    #menubar {
        width: auto;
        float: none;
    }
    #main {
        margin: 0;
    }    
}
</style>

<style>/* Stylesheet 2: */
body {
    font-family: Arial;
    background-color: #d14836;
    line-height: 20px;
}

.container {
    xmin-width: 900px;
}

.wrapper {
    position: relative;
    overflow: auto;
}

#top {
    color: #ffffff;
    padding: 15px;
    font-size: 30px;
    line-height: 26px;    
}

#top h1 {
    margin:0;
    line-height: 50px;
}

#menubar {
    width: 190px;
    float: right;
}

#main {
    padding: 10px;
    background-color: #ffffff;
    font: 80% Verdana;
}

#main h1, #main h2 {
    color: #d14836;
}

#sidebar {
    background-color: #F6DAD7;
    color: #d14836;
    padding: 10px;
}

#bottom {
    text-align: center;
    padding: 10px;
    font-size: 70%;
    color: #ffffff;
}

#menulist {
    padding:0;
    font: 16px verdana;
}

.menuitem {
    width: 155px;
    background-color: #d14836;
    border: 1px solid #d14836;
    border-radius: 40px;
    color: #ffffff;
    list-style-type: none;
    margin: 10px;
    padding: 5px;
    text-align: center;
    cursor: pointer;
}

.menuitem:nth-child(2) {
   background-color:white;
   color: #d14836;
   font-weight:bold;
}

.menuitem:hover {
    background-color: #ffffff;
    color: #d14836;
}

a {
    color: #d14836;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}
</style>

<style>/* Stylesheet 3: */
body {
    font: 100% Verdana;
    margin: 20px;
    line-height: 26px;
}

.container {
    xmin-width: 900px;
}

.wrapper {
    position: relative;
    overflow: auto;
}

#sidebar {
    background-color: #f1f1f1;
    border: 1px solid #d4d4d4;
    padding-left: 10px;
}

#bottom {
    text-align: center;
    padding: 10px;
    font-size: 70%;
    line-height: 14px;
}

h1, h2, h3 {
    color: #4CAF50;
}

#menulist {
    padding: 0;
    position: relative;
    overflow: auto;
}

.menuitem {
    width: 165px;
    float: left;
    background-color: #555555;
    color: #ffffff;
    list-style-type: none;
    margin: 4px;
    padding: 2px;
    text-align: center;
    cursor: pointer;
}

.menuitem:nth-child(3) {
   background-color:#4CAF50;
}

.menuitem:hover {
    background-color: #999999;
}

a {
    color: #000000;
}

a:hover {
    color: #84c754;
}
</style>
<style>/* Stylesheet 4: */
body {
    font: 100% Courier New;
    margin: 20px;
    line-height: 26px;
    background-color: #000000;
}

.container {
    xmin-width: 900px;
}

.wrapper {
    position: relative;
    overflow: auto;
}

#top {
    color: #84c754;
    padding: 15px;
}

#main {
    padding: 10px;
    color: #84c754;
}

#sidebar {
    color: #ffffff;
    border: 1px solid #ffffff;
    border-radius: 4px;
    padding: 10px;
    width: 320px;
    top: 0;
    right: 0;
    position: absolute;
    font-size: 80%;
    line-height: 20px;
}

#bottom {
    border: 1px solid #ffffff;
    border-radius: 4px;
    color: #ffffff;
    text-align: center;
    padding: 10px;
    font-size: 70%;
    line-height: 14px;
}

#top h1,#top p {
    margin: 0;
}

.menuitem {
    color: #84c754;
    cursor: pointer;
}

.menuitem:nth-child(4) {
    color:white;
    font-weight:bold;
}

.menuitem:hover {
    color: #ffffff;
}

a {
    color: #ffffff;
}

a:hover {
    color: #84c754;
}
@media (max-width: 600px) {
    #sidebar {
       width: auto;
       margin-bottom:10px;        
       position: relative;
    }    
}

</style>

</head>
<body>

<div class="container wrapper">
  <div id="top">
    <h1>Bienvenido a mi página web</h1>
    <p>Usa el menú para ver los diferentes estilos de CSS</p>
  </div>
  <div class="wrapper">
   <div id="menubar">
     <ul id="menulist">
       <li class="menuitem" onclick="reStyle(0)">Estilo 1
       <li class="menuitem" onclick="reStyle(1)">Estilo 2
       <li class="menuitem" onclick="reStyle(2)">Estilo 3
       <li class="menuitem" onclick="reStyle(3)">Estilo 4
       <li class="menuitem" onclick="noStyles()">Sin Estilos
     </ul>
    </div>
    <div id="main">
      <h1>La misma página con diferentes estilos</h1>
      <p>Esto es una demostración de como el CSS puede cambiar el layout del mismo HTML. Puedes cambiar el layout de la página seleccionando las diferentes opciones en el menu, o seleccionando los enlaces de acontinuación:<br>
      <a href="#" onclick="reStyle(0);return false">Estilo 1</a>,
      <a href="#" onclick="reStyle(1);return false">Estilo 2</a>,
      <a href="#" onclick="reStyle(2);return false">Estilo 3</a>,
      <a href="#" onclick="reStyle(3);return false">Estilo 4</a>.
      </p>
       <h2>Sin estilos</h2>
      <p>Esta página usa elementos DIV para agrupar diferentes secciones del HTML. Haz click aquí para ver como se vería la página sin estilos:<br><a href="#" onclick="noStyles();return false">Sin estilos</a>.</p>
   </div>
    <div id="sidebar">
      <h3>Side-Bar</h3>
      <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>
    </div>
  </div>  
  
  
  <div id="bottom">
    Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.
  </div>
</div>

<script>
function noStyles() {
    document.styleSheets[0].disabled = true;
    document.styleSheets[1].disabled = true;
    document.styleSheets[2].disabled = true;
    document.styleSheets[3].disabled = true;
}

function reStyle(n) {
    noStyles()
    document.styleSheets[n].disabled = false;
}

function closeBlackdiv() {
    var blackdiv, stylediv;
    blackdiv = document.getElementById("blackdiv")
    blackdiv.parentNode.removeChild(blackdiv);
    stylediv = document.getElementById("stylediv")
    stylediv.parentNode.removeChild(stylediv);
}

function showStyle(n) {
var div, text, blackdiv;
blackdiv = document.createElement("DIV");
blackdiv.setAttribute("style","background-color:#000000;position:absolute;width:100%;height:100%;top:0;opacity:0.5;margin-left:-20px;");
blackdiv.setAttribute("id","blackdiv");
blackdiv.setAttribute("onclick","closeBlackdiv()");
document.body.appendChild(blackdiv);
div = document.createElement("DIV");
div.setAttribute("id","stylediv");
div.setAttribute("style","background-color:#ffffff;padding-left:5px;position:absolute;width:auto;height:auto;top:100px;bottom:50px;left:200px;right:200px;overflow:auto;font-family: monospace; white-space: pre;line-height:16px;");
text = document.createTextNode(document.getElementsByTagName("STYLE")[n].innerHTML);
div.appendChild(text);
document.body.appendChild(div);
//alert(document.getElementsByTagName("STYLE")[n].innerHTML);
}
reStyle(0);
</script>
</body>
</html>
              
            
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