added hover color and transition in header

frontend/src/styles/Header.css

@@ -10,6 +10,11 @@
 #header-home-link {
     text-decoration: none;
     color: inherit;
+    transition: 0.3s;
+}
+
+#header-home-link:hover {
+    color: #6E83F9;
 }
 
 #header-restaurant-status {
@@ -27,10 +32,12 @@
 #header-button {
     height: 2rem;
     width: 2rem;
+    transition: 0.3s;
 }
 
 #header-button:hover {
     cursor: pointer;
+    color: #6E83F9;
 }
 
 @media only screen and (max-width: 600px) {