more letter spacing for settings footer links

Author: zubyj

src/popup/popup.css

@@ -284,18 +284,20 @@ a {
 }
 
 /* Footer elements */
-#review {
+#footer {
     width: var(--settings-width);
     text-align: left;
+    letter-spacing: 1px;
+    font-weight: 550;
 }
 
-#review a{
+#footer a{
     padding-top: var(--spacing);
     font-size: var(--base-font-size);
     opacity: 0.8;
     display: inline-block;
 }
 
-#review a:hover {
+#footer a:hover {
     opacity: 1;
 }

src/popup/settings.html

@@ -47,13 +47,13 @@
             <button id="show-difficulty-btn" class="material-button settings-btn">
                 <span id="show-difficulty-icon"></span> Show Difficulty
             </button>
-            <div id="review">
+            <div id="footer">
                 View the
                 <a target="_blank" href="https://github.com/zubyj/leetcode-explained">
                     source code
                 </a>
             </div>
-            <div id="review">
+            <div id="footer">
                 Leave us a
                 <a target="_blank"
                     href="https://chrome.google.com/webstore/detail/leetcode-explained/cofoinjfjcpgcjiinjhcpomcjoalijbe">