added new oboarding panel

src/css/popup.css

@@ -356,6 +356,35 @@ table {
   transition: background-color 75ms;
 }
 
+.half-button-wrapper {
+  width: 100%;
+  flex-direction: row;
+  display: flex;
+  align-items: center;
+  height: 44px;
+}
+
+.half-onboarding-button {
+  align-items: center;
+  background-color: #0996f8;
+  border-radius: 3px;
+  color: white;
+  display: flex;
+  font-size: 14px;
+  inline-size: 50%;
+  justify-content: center;
+  text-decoration: none;
+  transition: background-color 75ms;
+  flex: 1 0 auto;
+  height: 44px;
+  margin: 0 4px 0 0;
+}
+
+.grey-button {
+  background-color: #E3E3E3;
+  color: #000;
+}
+
 .onboarding-button:hover,
 .onboarding-button:active {
   background-color: #0675d3;
@@ -974,9 +1003,3 @@ span ~ .panel-header-text {
 .amo-rate-cta {
   background: #0f1126;
 }
-
-.no-sync {
-  line-height: 0;
-  margin-left: 160px;
-  text-decoration: underline;
-}