Display membership

public/css/style.css

@@ -305,9 +305,14 @@ summary:focus-visible {
   display: inline-block;
   padding: 10px 16px;
   border: 2px solid var(--color-accent);
+  border-radius: 0;
   background: var(--color-accent);
   color: var(--color-background);
+  font: inherit;
   font-weight: 700;
+  line-height: 1.4;
+  text-align: center;
+  cursor: pointer;
   transition: filter 0.2s ease;
 }