fix(styles): ✏️ add missing outline props

Author: JasonWarrenUK

src/app.css

@@ -30,9 +30,9 @@ body {
 }
 
 .dev-div { outline: 2px solid var(--color-teal); }
-.dev-tile { outline-color: var(--color-blue-bright); }
-.dev-list { outline-color: var(--color-purple); }
-.dev-button { outline-color: var(--color-pink); }
+.dev-tile { outline: 2px solid var(--color-blue-bright); }
+.dev-list { outline: 2px solid var(--color-purple); }
+.dev-button { outline: 2px solid var(--color-pink); }
 .dev-text { margin: 0; padding: 0 1rem; }
 
 .dev-inactive {