started implementing local storage

src/main/resources/static/main.css

@@ -81,6 +81,7 @@ header {
 .hidden {
     display: none;
 }
+
 #search-entry:focus-visible {
     outline: none;
 }
@@ -117,6 +118,7 @@ header {
     align-items: center;
     gap: .5em;
 }
+
 /* Buttons */
 .upvote-btn, .downvote-btn, #search-btn, #filter-btn, #sort-btn, #reset-tools-btn {
     background: var(--icon-url) no-repeat;
@@ -143,6 +145,7 @@ header {
     --icon-url: url(looking-glass.svg);
     --icon-size: 1rem;
 }
+
 #filter-btn {
     --icon-url: url(filter.svg);
     --icon-size: 1rem;
@@ -158,6 +161,10 @@ header {
     --icon-size: 1rem;
 }
 
+.isVoted {
+    filter: brightness(1.75);
+}
+
 .divider {
     width: .05rem;
     height: 1rem;