Fix Styling on Tables, Pre>Code

Add the following custom CSS to make tables and preformatted code look less terrible:

pre {
	background-color: lightsteelblue;
}

pre > code {
	background: none;
}

table {
	background: none;
}

table thead tr th,
table thead tr td,
table tbody tr th,
table tbody tr td {
	color: white;
}

table thead,
table tbody tr,
table thead tr {
	background: none !important;
}