feat: add page style

pagestyle.css

@@ -0,0 +1,62 @@
+body {
+  min-width: 30em;
+  max-width: 60em;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+nav {
+  text-align: center;
+  font-size: 16pt;
+  a {
+    text-decoration: none;
+    color: black;
+  }
+  border-bottom: 2pt solid grey;
+}
+
+footer {
+  border-top: 2pt solid grey;
+  padding-block: 0.5em;
+  font-size: 10pt;
+}
+
+main {
+  padding: 0.5em;
+  code {
+    background-color: aliceblue;
+  }
+  a:visited {
+    color: darkorange;
+  }
+  a:link {
+    color: darkcyan;
+  }
+  a {
+    text-decoration: none;
+  }
+  figure {
+    font-size: 10pt;
+    figcaption {
+      padding-left: 1em;
+    }
+    figcaption:before {
+      content: "| ";
+    }
+  }
+  pre {
+    padding-block: 0.5em;
+    border-block: 1pt solid grey;
+    font-size: 8pt;
+  }
+  pre code.shell:before {
+    content: "$ ";
+  }
+  pre code.shell {
+    background-color: white;
+  }
+  h2,
+  h3 {
+    margin-top: 1.5em;
+  }
+}