Added 404 page

public/styles/shared.css

@@ -15,3 +15,85 @@ body {
 	overflow-y: auto;
 }
 
+h1 {
+	font: 24pt;
+}
+
+h2 {
+	font: 14pt;
+}
+
+br {
+	padding-bottom: .5rem;
+}
+
+hr {
+	border: none;
+	height: 1px;
+	color: black;
+	background-color: black;
+}
+
+ul {
+	list-style-type: disc;
+	list-style-position: inside;
+	padding-bottom: .5rem;
+}
+
+.centered {
+	text-align: center;
+}
+
+.right {
+	text-align: right;
+}
+
+/* footer */
+footer {
+	flex: 0 1 auto;
+	justify-self: flex-end;
+	display: flex;
+	flex-direction: row;
+	justify-content: center;
+	align-items: center;
+}
+
+/* central display */
+.central {
+	flex: 1;
+	display: flex;
+	flex-direction: column;
+	padding: 0 10px;
+	min-height: 100vh;
+}
+
+@media screen and (min-width: 768px) {
+	.central {
+		margin: 0 10%;
+	}
+}
+
+.central p {
+	padding-bottom: .5rem;
+}
+
+.page {
+	flex: 1 1 auto;
+	display: flex;
+	flex-direction: column;
+	justify-content: flex-start;
+}
+
+/* warning message */
+.warning {
+	flex: 0 1 auto;
+	display: none;
+	flex-direction: row;
+	justify-content: center;
+	align-content: flex-end;
+	border-style: solid;
+	border-width: 2px;
+	border-color: #ff0000;
+	background: #ff6666;
+}
+