Multiple UI Improvements (#3038)

webapp/utils/constants.jsx

@@ -305,7 +305,7 @@ export default {
             sidebarTextHoverBg: '#e6f2fa',
             sidebarTextActiveBorder: '#378FD2',
             sidebarTextActiveColor: '#111111',
-            sidebarHeaderBg: '#2389d7',
+            sidebarHeaderBg: '#3481B9',
             sidebarHeaderTextColor: '#ffffff',
             onlineIndicator: '#7DBE00',
             awayIndicator: '#DCBD4E',
@@ -315,7 +315,7 @@ export default {
             centerChannelColor: '#333333',
             newMessageSeparator: '#FF8800',
             linkColor: '#2389d7',
-            buttonBg: '#2389d7',
+            buttonBg: '#23A2FF',
             buttonColor: '#FFFFFF',
             mentionHighlightBg: '#fff2bb',
             mentionHighlightLink: '#2f81b7',