styles.css

<style>
#header {
    background-color:black;
    color:white;
    text-align:center;
    padding:0px;
}
#nav {
    line-height:30px;
    background-color:rgba(240,240,240,0.89);
    height:100%;
    width:18%;
	top:0px;
	left:0px;
    float:left;
    padding:0px; 
	position:fixed;
	z-index:1;	
}

#nav_inner {
	padding:0px;
	font-family:Helvetica, Arial, sans-serif;
	list-style-type: none;
	text-align:center;
}

#graph_column {
	left:20%;
	position:relative;
}

#ex_column {
	position:absolute;
	top:120px;
}

#form {
	width:100%; 
	float:none;
	padding:10px; 
	height:100px; 
	position:relative;
	text-align:center;
}
/*
#section {
    width:60%;
    float:none;
    padding:10px;
	position: relative;
	display:inline-block;
}
*/

#footer {
    background-color:black;
    color:white;
    clear:both;
    text-align:center;
    padding:5px; 
}

#canvas {
	
}

ul a {
	color:inherit;
	text-decoration:none;
}

.salary_input {
	width:48%;
	font-size:21pt;
	font-family:Helvetica, Arial, sans-serif;
}

.nav_selected {
	background-color: rgba(178, 229, 127, 0.8);
}

.explanation {
	position:relative; 
	margin-bottom:100px; 
	margin-top:50px;
	font-size:10pt;
	font-family:Helvetica, Arial, sans-serif;
	background-color: rgba(230, 230, 230, 0.5);
	width:90%;
	padding:13px;
	overflow:auto;
}

.savings {
	width:47%;
	background-color:rgba(50,50,50,0.1);
	padding-left:10px;
	padding-bottom:10px;
}

</style>