Timeline: Style and layout adjustments

src/styles/components/_timeline.sass

@@ -1,25 +1,11 @@
 .timeline
-    .jumbotron
-        padding-top: 6em
-        padding-bottom: 6em
-
-        *
-            font-size: $h1-font-size
-
-        .lead
-            font-size: $font-size-base
-    .h5
-        text-align: right
-        background: $body-bg
-        opacity: 0.8
-        margin-right: -15px
-        margin-left: -15px
-        padding-right: 15px
-    
     .group
         opacity: 0
         animation: fade-in 500ms forwards
 
+    .group-title
+        background-color: $white
+
 body.homepage
     .timeline
         .sticky-top