fix some frontend issues

vue/src/assets/base.css

@@ -70,6 +70,10 @@
 
 body {
   min-height: 100vh;
+  /* Full-bleed article images use a `100vw`-based breakout, which can be
+     wider than the visible content area (scrollbar) and would otherwise
+     introduce a horizontal scrollbar. */
+  overflow-x: hidden;
   color: var(--color-text);
   background: var(--color-background);
   transition: color 0.5s, background-color 0.5s;