body
{
    margin: 0px;
    padding: 0px;
	font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
	font-size: 16px;
	background-color: #1a1a1a;
	line-height: 25px;
}
img#logo
{
	height: 150px;
	width: 150px;
	filter: invert(100%);
	margin-bottom: 20px;
	padding: 5px;
    border-radius: 5px;
}
header
{
	margin: 30px 0 30px 0;
	text-align: center;
	font-size: 16px;
	width: 100%;
}
ul
{
    margin: 0px;
}
#intro:hover
{
	color: #5fb962;
    transition: color 0.5s;
}
#about:hover
{
	color: #ed457d;
    transition: color 0.5s;
}
#courses:hover
{
	color: #00cbe6;
    transition: color 0.5s;
}
#contact:hover
{
	color: #ff6333;
    transition: color 0.5s;
}
#intro, #about, #courses, #contact
{
    color: #e6e6e6;
	background-color: #242424;
	width: 900px;
	margin: auto;
	padding: 20px;
	margin-top: 10px;
    box-shadow: 0 0 12px 6px rgba(0,0,0,0.05);
    border-radius: 5px;
}
footer
{
    box-shadow: 0 0 12px 6px rgba(0,0,0,0.05);
    color: #e6e6e6;
	background-color: #212121;
	width: 250px;
    margin: auto;
	margin-top: 30px;
	text-align: center;
    border-radius: 5px;
	padding: 10px;
}
footer:after
{
    content: 'Thank you for visiting!';
}
footer:hover:after
{
    content: '😁';
}
a
{
	color: inherit;
}
a#stackoverflow
{
    float: right;
}