more style fixes to the build header

app/styles/app/_mixins/vars.sass

@@ -70,6 +70,7 @@ $font-size-xxl: 30px
 $grey1: #A5ACAD
 $grey2: #969496
 $grey3: #808080
+$grey4: #e6e8e8
 $grey: $grey1
 $cream-light: #FAFAF8
 $cream-dark: lighten(mix(#F7F7F4, $grey), 10)

app/styles/app/modules/icons.sass

@@ -55,7 +55,7 @@
 .icon.push
   background-image: inline-image('svg/push-icon.svg')
 
-.icon.pull-request
+.icon.pull_request
   background-image: inline-image('svg/pull-request-icon.svg')
 
 .icon-lock

app/styles/app/modules/tabs.sass

@@ -16,18 +16,21 @@
     color: $grey2
     padding: .2em 0
 
-  .active
-    a
-      position: relative
-      color: $teal2
-      &:after
-        content: ""
-        position: absolute
-        left: 0
-        bottom: -3px
-        width: 100%
-        height: 2px
-        background-color: $teal2
+  .active a,
+  a:hover
+    position: relative
+    color: $teal2
+    &:after
+      content: ""
+      position: absolute
+      left: 0
+      bottom: -3px
+      width: 100%
+      height: 2px
+      background-color: $teal2
+  .active a
+    font-weight: 600
+
 
 
   @media #{$medium-up}

app/styles/app/modules/tiles.sass

@@ -26,7 +26,7 @@
   small
     margin: 0
     font-weight: 400
-    font-size: 15px
+    font-size: $font-size-m
     color: $grey3
     line-height: 1
   small
@@ -69,11 +69,16 @@
     width: 1.1em
     height: 1.2em
     margin: .7em auto 1em
-  .request-kind
+  .icon.push
     display: block
     width: 1.4em
     height: 1.1em
-    margin: .5em auto 1.1em
+    margin: -0.2em auto 0
+  .icon.pull_request
+    display: block
+    width: 1.1em
+    height: 1.6em
+    margin: -0.5em auto 0
 
 .tile-author
   img
@@ -94,7 +99,7 @@
 .tile--build
   .tile-main
     @media #{$medium-up}
-      border-right: solid 1px $grey1
+      border-right: solid 1px $grey4
     @media #{$xlarge-up}
       @include grid-column(8)
   .tile-additional

app/templates/builds.hbs

@@ -4,7 +4,7 @@
     <div {{bind-attr class="build.color :tile :tile--small :tile--build :row"}}>
       <div class="tile-status">
         <span class="icon icon-status passed"></span>
-        <span class="icon request-kind push"></span>
+        <span {{bind-attr class=":request-kind build.eventType :icon"}}></span>
       </div>
       <div class="column tile-main medium-6">
         <h2>