fix: library header now maintains its size on smaller screens

Theme/ElegantFin-theme-nightly.css

@@ -984,3 +984,17 @@ div[data-role=controlgroup] a.ui-btn-active {
     border-radius: var(--smallRadius);
     margin-inline-start: 1em;
 }
+
+@media (min-width: 62em) {
+  .sectionTabs {
+    -webkit-align-items: center;
+    align-items: center;
+    -webkit-align-self: center;
+    align-self: center;
+    -webkit-justify-content: center;
+    justify-content: center;
+    margin-top: -4.3em;
+    position: relative;
+    width: auto;
+  }
+}