finish sk restructure, a11y and optimisations

src/lib/app.css

@@ -1,4 +1,4 @@
-@import url("/font/inter/inter.css");
+@import url("../font/inter/inter.css");
 
 :root {
     --bg-1000: #fff6de;
@@ -40,6 +40,32 @@ body {
     box-sizing: border-box;
 }
 
+a {
+    color: var(--accent);
+    text-decoration: none;
+}
+
+a:hover {
+    text-decoration: underline;
+}
+
+#spacesocial-app {
+    margin: auto 0;
+    padding: 0 16px;
+    display: flex;
+    flex-direction: row;
+    justify-content: center;
+    gap: 16px;
+}
+
+header, #widgets {
+    width: 300px;
+}
+
+main {
+    width: 732px;
+}
+
 .throb {
     animation: .25s throb alternate infinite ease-in;
 }