How to scale div content based on fixed height in all devices

Question

how to scale the #left-content div based on the window height,and i need to display all content inside the fixed #left-bg. if i open in mobile or tablet the content is hidden .

 .left-bg{ background-color:red; position:fixed; width:50%; height:100%; } .left-content{ color:#fff; } 

 <div class="left-bg"> <div class="left-content"> bla bla bla adsfjdhasgfkjsdgf jkdgaskhfasdkfhjl dasfghfdkajsfdkasf jghdasfkjghfkgf dajshgfkasdjgfs adsfjdhasgfkjsdgf<BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR> jkdgaskhfasdkfhjl dasfghfdkajsfdkasf jghdasfkjghfkgf dajshgfkasdjgfs adsfjdhasgfkjsdgf jkdgaskhfasdkfhjl dasfghfdkajsfdkasf jghdasfkjghfkgf dajshgfkasdjgfs adsfjdhasgfkjsdgf jkdgaskhfasdkfhjl dasfghfdkajsfdkasf jghdasfkjghfkgf </div> </div> 

Answer 1

Use flexbox. Break up your content in 2 divs:

<div class="left-bg">
  <div class="left-content-top">
    bla bla bla
    adsfjdhasgfkjsdgf
    jkdgaskhfasdkfhjl
    dasfghfdkajsfdkasf
    jghdasfkjghfkgf
    dajshgfkasdjgfs
    adsfjdhasgfkjsdgf</div>
   <div class="left-content-bottom">
    jkdgaskhfasdkfhjl
    dasfghfdkajsfdkasf
    jghdasfkjghfkgf
    dajshgfkasdjgfs
    adsfjdhasgfkjsdgf
    jkdgaskhfasdkfhjl
    dasfghfdkajsfdkasf
    jghdasfkjghfkgf
    dajshgfkasdjgfs
    adsfjdhasgfkjsdgf
    jkdgaskhfasdkfhjl
    dasfghfdkajsfdkasf
    jghdasfkjghfkgf
    </div>
</div>

And flex it with space between.

.left-bg{
background-color:red; 
  position:fixed;
  width:50%;
  display: flex;
  justify-content: space-between;
  flex-direction: column;
  height: 100vh;

}
.left-content{
color:#fff; 

}

Flex is magic. See the pen here: http://codepen.io/anon/pen/vNKQLW?editors=110

Is that what you were after?