CodePen

HTML

            
              
<div id="page_Page">
  
  <div id="page_head">
    <h1>Header</h1>
    <p>This is just a test for RD.</p>
  </div>
  
  <div id="page_left">
    <h2>Left</h2>
    <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>  
  </div>
  
  <div id="page_side">
    <h3>Side</h3>
    <p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>  
  </div>
  
  <div id="page_foot">
    <h4>Footer</h4>
  </div>
  
</div>
            
          
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via HTML Inspector

CSS

            
              
body
{
    font:              1em/150% Arial, Helvetica, sans-serif;
}

a
{
    color:             #669;
    text-decoration:   none;
}

a:hover
{
    text-decoration:   underline;
}

h1
{
    font:              bold 36px/100% Arial, Helvetica, sans-serif;
}


html
{
    overflow-y:        scroll;
}

#page_head, #page_left, #page_side, #page_foot
{
    border-radius:     0.5em;
    padding:           0.5em;
    margin:            0.25%;
    border:            thin solid #777;
    box-sizing:        border-box;
  
}

#page_page
{
    width:             98%;
    margin:            20px auto;
}

#page_head
{
    height:            180px;
    background-color:  #FFC0CB;
}

#page_left
{
    float:             left;
    background-color:  #90EE90;
    width:             75%;
  
}

#page_side
{
    float:             right;
    background-color:  #DDA0DD;
    width:24%;
    margin-left:0;
}

#page_foot
{
  clear:both;
  background-color:  #FFD700;
  margin-bottom:1%;
}

/* MEDIA QUERIES */

/* for 1280px or less */
@media screen and (max-width: 1280px)
{
    
    #page_left
       {

    }
    #page_side
       {

    }
}

/* for 980px or less */
@media screen and (max-width: 980px) {
	
	#page_left {
    width:64%;
	}

  #page_side {
    width:35%;
  }
}

/* for 700px or less */
@media screen and (max-width: 700px) {

	#page_left {
		width: auto;
		float: none;
    margin: 1% 0.5%;
	}
	#page_side {
		width: auto;
		float: none;
    margin-bottom: 1%;
	}

}

/* for 480px or less */
@media screen and (max-width: 480px) {

	h1 {
		font-size: 24px;
	}
	#page_side {

}

            
          
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