Left Sidebar

HTML

<body><div class="fixed-sidebar">
Hello
</div>
<div class="offset-content">
Hello

</div>

</body>

CSS

.fixed-sidebar {
top: 0px;
left: 0px;
width: 12%;
color: white;
background: #CCC;
height: 100%;
position: absolute;
}

.offset-content {
border: solid red 0px;
width: 68%;

height: 100%;
background: orange;
color: black;
margin-left: 300px;
float: right;
}