fixed layout

public/css/post.css

@@ -0,0 +1,41 @@
+.post main {
+	display: flex;
+	flex-direction: column;
+	max-width: 786px;
+}
+
+.post main * {
+	max-width: 786px;
+}
+
+.post nav a {
+	background-color: var(--background-color-strong);
+	border-radius: 8px;
+	padding: 8px 12px;
+	display: inline-block;
+	text-decoration: none;
+	color: inherit;
+	font-weight: bold;
+	margin-block: 0px 8px;
+}
+
+.post #post-info {
+	display: flex;
+	max-width: 786px;
+	flex-direction: column;
+	justify-content: center;
+	padding-block-end: 0px;
+}
+
+.post h2 {
+	font-size: 1.6em;
+	font-weight: bold;
+}
+
+.post p ~ h2 {
+	margin-block: 2em 0.5em;
+}
+
+.post p ~ h3 {
+	margin-block: 1.5em 0.5em;
+}