Minor adjustment to the banner

Author: Hongxin Zhang

src/main/webapp/app/components/userMessager/UserMessage.tsx

@@ -37,7 +37,7 @@ if (
     // BASED ON USERS LOCALSTORAGE
     {
       dateEnd: 100000000000000,
-      content: `Join our webinar to learn how to use OncoKB effectively. First webinar <strong>May 7th 3pm-4pm EDT</strong>. <a class="btn btn-secondary btn-sm ml-2" target="_blank" href="https://meetmsk.zoom.us/meeting/register/vJcvf-CvrzsshBK8VEiD5J9DSRDf7C--qg">Click here to register!</a>`,
+      content: `Join our webinar to learn how to use OncoKB effectively, <strong>May 7th 3pm-4pm EDT</strong>. <a class="btn btn-primary btn-sm ml-2 user-messager-container-button" target="_blank" href="https://meetmsk.zoom.us/meeting/register/vJcvf-CvrzsshBK8VEiD5J9DSRDf7C--qg">Click here to register!</a>`,
       id: '2020_spring_webinar'
     }
   ];

src/main/webapp/app/index.scss

@@ -27,6 +27,15 @@ body,
   color: $oncokb-orange;
 }
 
+.user-messager-container-button {
+  background-color: $oncokb-color-oncogenic;
+  border-color: $oncokb-color-oncogenic;
+  &:hover {
+    background-color: #1762ab;
+    border-color: #1762ab;
+  }
+}
+
 .header {
   .navbar-brand {
   }