add ui

ui/pages/error.page.styl

@@ -0,0 +1,44 @@
+$error_width = 650px
+$twd2_width = 270px
+
+.page--error
+  .error__icon-container,
+  .error__text-container
+    text-align: center
+    margin: rem(20px 0)
+
+  .error__text-container
+    color: #777
+    line-height: 1.5
+
+    h1
+      font-size: 4rem
+      color: #999
+      margin-bottom: rem(20px)
+
+    li
+      list-style: decimal inside
+
+  .error__twd2
+    background: url('error/twd2.svg') no-repeat
+    width: $twd2_width
+    height: $twd2_width
+    display: inline-block
+
+  +above(rupture.mobile-cutoff)
+    .error__container
+      width: rem(700px)
+      margin: rem(50px) auto
+      position: relative
+
+    .error__icon-container
+      float: left
+      width: $twd2_width
+
+    .error__text-container
+      left: rem($twd2_width + 50px)
+      position: absolute
+      top: 50%
+      transform: translateY(-50%)
+      text-align: left
+      margin: 0