fix code block style

_sass/style.scss

@@ -47,7 +47,7 @@ h1, h2, h3, h4, h5, h6 {
 	border-bottom: thin solid rgba(255, 255, 255, 0.2);
 }
 
-p, code {
+p, code, ul, ol {
 	font-size: 1rem;
 	line-height: 1.5rem;
 	font-weight: 400;
@@ -58,6 +58,18 @@ code {
 	border-radius: 4px;
 }
 
+pre {
+	display: block;
+	padding: 20px;
+	border-radius: 4px;
+	background-color: rgba(0, 0, 0, 0.5);
+	overflow-x: auto;
+
+	code {
+		background: none;
+	}
+}
+
 header h1 {
 	text-align: center;
 	margin: 20px 0 0;
@@ -112,7 +124,6 @@ nav {
 				padding: 20px;
 				display: inline-block;
 				font-weight: 700;
-				text-decoration: none;
 			}
 		}
 	}