style: Fix tag color and search box in dark theme

Close #632

layouts/partials/css/academic.css

@@ -1523,7 +1523,6 @@ body.dark {
 .dark code {
   color: rgb(139, 233, 253);
   background-color: rgb(68, 71, 90);
-
 }
 
 .dark pre {
@@ -1615,3 +1614,23 @@ body.dark {
   background: rgb(40, 42, 54);
   color: rgb(248, 248, 242);
 }
+
+/* Algolia search input */
+.dark .ais-search-box--input {
+  background-color: rgb(68, 71, 90);
+}
+
+.dark .label-default {
+  color: rgba(255, 255, 255, .68);
+  background: rgba(255, 255, 255, .2);
+}
+
+.dark .label-default[href]:focus,
+.dark .label-default[href]:hover {
+  background: rgba(255, 255, 255, .3);
+}
+
+.dark a.label:focus,
+.dark a.label:hover {
+  color: rgba(255, 255, 255, .68);
+}