Greenlight landing page layout adjustments, general cleanup and responsive styles (#271)

app/assets/stylesheets/main.scss

@@ -28,8 +28,15 @@
   height: 40%;
 }
 
+.lead {
+  font-size:18px;
+}
+
 .feature-stamp {
-  border-radius: 6px;
+  .stamp {
+    padding:1em 1.5em;
+    height:auto;
+  }
 }
 
 .or-line {
@@ -47,25 +54,6 @@
   }
 }
 
-.img-cycle img {
-  display: none;
-  position: absolute;
-  top: 0;
-  left: 0;
-}
-
-.img-cycle img:first-child {
-  display:block;
-}
-
-.green-grad {
-  background: linear-gradient(to right, rgba(164,179,87,1) 0%, rgba(117,137,12,1) 100%);
-  -webkit-background-clip: text;
-  -webkit-text-fill-color: transparent;
-}
-
-.blue-grad {
-  background: linear-gradient(to right, rgba(65,105,225,1) 0%,  rgba(0,0,225,1) 100%);
-  -webkit-background-clip: text;
-  -webkit-text-fill-color: transparent;
+.display-4 {
+  font-weight: normal;
 }