diff --git a/app/controllers/Dev.scala b/app/controllers/Dev.scala
index 7b393fd083..98bcd53d3c 100644
--- a/app/controllers/Dev.scala
+++ b/app/controllers/Dev.scala
@@ -62,4 +62,8 @@ object Dev extends LilaController {
   private def runAs(user: lila.user.User.ID, command: String): Fu[String] =
     Env.mod.logApi.cli(user, command) >>
       Env.api.cli(command.split(" ").toList)
+
+  def ui = Open { implicit ctx =>
+    Ok(html.dev.ui()).fuccess
+  }
 }
diff --git a/app/ui/scalatags.scala b/app/ui/scalatags.scala
index f98674edf6..18cb8e1780 100644
--- a/app/ui/scalatags.scala
+++ b/app/ui/scalatags.scala
@@ -65,7 +65,7 @@ trait ScalatagsTemplate extends Styles
   with ScalatagsPrefix {
 
   val trans = lila.i18n.I18nKeys
-  val main = tag("main")
+  def main = scalatags.Text.tags2.main
 }
 
 object ScalatagsTemplate extends ScalatagsTemplate
diff --git a/app/views/dev/ui.scala b/app/views/dev/ui.scala
new file mode 100644
index 0000000000..64ff41d258
--- /dev/null
+++ b/app/views/dev/ui.scala
@@ -0,0 +1,30 @@
+package views.html.dev
+
+import lila.api.Context
+import lila.app.templating.Environment._
+import lila.app.ui.ScalatagsTemplate._
+
+object ui {
+
+  def apply()(implicit ctx: Context) = views.html.base.layout(
+    title = "UI test",
+    moreCss = responsiveCssTag("palette"),
+    responsive = true
+  ) {
+      main(cls := "ui-test box box-pad")(
+        h1("H1 header title"),
+        h2("H2 header title"),
+        h3("H3 header title"),
+        h4("H4 header title"),
+        p(
+          "<p> Random quotes: ",
+          (1 to 10).map(_ => lila.quote.Quote.one.text).mkString(" ")
+        ),
+        div(cls := "palette")(
+          List("background", "primary", "secondary", "accent", "brag", "error", "fancy", "font").map { c =>
+            div(cls := s"color $c")(div(cls := "variants"))
+          }
+        )
+      )
+    }.toHtml
+}
diff --git a/app/views/game/importGame.scala b/app/views/game/importGame.scala
index 4a9d2e8b5e..18de076ffb 100644
--- a/app/views/game/importGame.scala
+++ b/app/views/game/importGame.scala
@@ -19,7 +19,7 @@ object importGame {
     openGraph = lila.app.ui.OpenGraph(
       title = "Paste PGN chess game",
       url = s"$netBaseUrl${routes.Importer.importGame.url}",
-      description = "When pasting a game PGN, you get a browsable replay, a computer analysis, a game chat and a sharable URL"
+      description = trans.importGameExplanation.txt()
     ).some,
     responsive = true
   ) {
diff --git a/conf/routes b/conf/routes
index fe62557972..ee24ae0e91 100644
--- a/conf/routes
+++ b/conf/routes
@@ -589,6 +589,7 @@ POST  /dev/cli                         controllers.Dev.cliPost
 POST  /cli                             controllers.Dev.command
 GET   /dev/settings                    controllers.Dev.settings
 POST  /dev/settings/:id                controllers.Dev.settingsPost(id: String)
+GET   /dev/ui                          controllers.Dev.ui
 
 # Mobile Push
 POST  /mobile/register/:platform/:deviceId controllers.Main.mobileRegister(platform: String, deviceId: String)
diff --git a/translation/source/site.xml b/translation/source/site.xml
index 17909df04f..b2a7a4beb3 100644
--- a/translation/source/site.xml
+++ b/translation/source/site.xml
@@ -338,8 +338,8 @@
   <string name="fromPosition">From position</string>
   <string name="continueFromHere">Continue from here</string>
   <string name="importGame">Import game</string>
-  <string name="importGameExplanation">When pasting a game PGN you get a browsable replay,
-a computer analysis, a game chat and a shareable URL.</string>
+  <string name="importGameExplanation">Paste a game PGN to get a browsable replay,
+computer analysis, game chat and shareable URL.</string>
   <plurals name="nbImportedGames">
     <item quantity="one">%s imported game</item>
     <item quantity="other">%s imported games</item>
diff --git a/ui/common/css/_lichess.scss b/ui/common/css/_lichess.scss
index 46c3ccc71b..5de1bbf648 100644
--- a/ui/common/css/_lichess.scss
+++ b/ui/common/css/_lichess.scss
@@ -7,10 +7,12 @@
 @import 'abstracts/mixins';
 @import 'abstracts/extends';
 @import 'abstracts/z-index';
+@import 'abstracts/fluid-size';
 
 @import 'base/reset';
 @import 'base/fonts';
 @import 'base/elements';
+@import 'base/typography';
 @import 'base/layout';
 @import 'base/data-icon';
 
diff --git a/ui/common/css/abstracts/_extends.scss b/ui/common/css/abstracts/_extends.scss
index 1a80ddd21a..4b3f3447c2 100644
--- a/ui/common/css/abstracts/_extends.scss
+++ b/ui/common/css/abstracts/_extends.scss
@@ -3,10 +3,12 @@
   padding-bottom: 100%;
   width: 100%;
 }
+%box-radius {
+  @include box-radius;
+}
 %box-shadow {
-  box-shadow: $box-shadow;
+  @include box-shadow;
 }
 %box-neat {
-  box-shadow: $box-shadow;
-  border-radius: $border-radius;
+  @include box-neat;
 }
diff --git a/ui/common/css/abstracts/_fluid-size.scss b/ui/common/css/abstracts/_fluid-size.scss
new file mode 100644
index 0000000000..595304b33f
--- /dev/null
+++ b/ui/common/css/abstracts/_fluid-size.scss
@@ -0,0 +1,22 @@
+@function strip-unit($value) {
+  @return $value / ($value * 0 + 1);
+}
+
+@mixin fluid-size($min-vw, $max-vw, $min-font-size, $max-font-size) {
+  $u1: unit($min-vw);
+  $u2: unit($max-vw);
+  $u3: unit($min-font-size);
+  $u4: unit($max-font-size);
+
+  @if $u1 == $u2 and $u1 == $u3 and $u1 == $u4 {
+    & {
+      font-size: $min-font-size;
+      @media screen and (min-width: $min-vw) {
+        font-size: calc(#{$min-font-size} + #{strip-unit($max-font-size - $min-font-size)} * ((100vw - #{$min-vw}) / #{strip-unit($max-vw - $min-vw)}));
+      }
+      @media screen and (min-width: $max-vw) {
+        font-size: $max-font-size;
+      }
+    }
+  }
+}
diff --git a/ui/common/css/abstracts/_media-queries.scss b/ui/common/css/abstracts/_media-queries.scss
index c9308a3cf1..6ba88d0173 100644
--- a/ui/common/css/abstracts/_media-queries.scss
+++ b/ui/common/css/abstracts/_media-queries.scss
@@ -25,6 +25,8 @@ $mq-hover-no: (hover none);
 
 /* Aliases */
 
+$mq-main-margin: $mq-medium;
+
 $mq-topnav-visible: $mq-medium;
 $mq-topnav-hidden: $mq-not-medium;
 
diff --git a/ui/common/css/abstracts/_mixins.scss b/ui/common/css/abstracts/_mixins.scss
index 10d8f5269e..5c299d7ce3 100644
--- a/ui/common/css/abstracts/_mixins.scss
+++ b/ui/common/css/abstracts/_mixins.scss
@@ -1,6 +1,12 @@
-@mixin box-neat {
+@mixin box-radius {
+  border-radius: $box-radius-size;
+}
+@mixin box-shadow {
   box-shadow: $box-shadow;
-  border-radius: $border-radius;
+}
+@mixin box-neat {
+  @include box-radius;
+  @include box-shadow;
 }
 
 @mixin board-scale-config {
diff --git a/ui/common/css/abstracts/_variables.scss b/ui/common/css/abstracts/_variables.scss
index 3096c5b67a..576c66fd32 100644
--- a/ui/common/css/abstracts/_variables.scss
+++ b/ui/common/css/abstracts/_variables.scss
@@ -2,7 +2,7 @@ $font-path: "../font";
 
 $block-gap: 1.5vmin;
 
-$border-radius: 3px;
+$box-radius-size: 3px;
 
 $site-header-tall-height: 60px;
 $site-header-short-height: 40px;
diff --git a/ui/common/css/base/_elements.scss b/ui/common/css/base/_elements.scss
index 79c96bb31e..5dff910364 100644
--- a/ui/common/css/base/_elements.scss
+++ b/ui/common/css/base/_elements.scss
@@ -1,18 +1,9 @@
-html {
-  font: 1rem/1.6 'Noto Sans', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, Sans-Serif;
-}
-
 body {
   background: $c-background linear-gradient(to bottom, $c-body-gradient, $c-background 116px) no-repeat;
   color: $c-font;
   overflow-x: hidden;
 }
 
-h1 {
-  font: 3rem 'Roboto';
-  font-weight: normal;
-}
-
 a {
   color: $c-link;
   text-decoration: none;
diff --git a/ui/common/css/base/_layout.scss b/ui/common/css/base/_layout.scss
index f7cdad4ca0..2bccca6592 100644
--- a/ui/common/css/base/_layout.scss
+++ b/ui/common/css/base/_layout.scss
@@ -5,7 +5,7 @@ body {
   }
 
   --main-margin: 0;
-  @include breakpoint($mq-medium) {
+  @include breakpoint($mq-main-margin) {
     --main-margin: #{$block-gap};
     margin-bottom: $block-gap;
   }
diff --git a/ui/common/css/base/_typography.scss b/ui/common/css/base/_typography.scss
new file mode 100644
index 0000000000..687dcac2de
--- /dev/null
+++ b/ui/common/css/base/_typography.scss
@@ -0,0 +1,37 @@
+/* Viewport limits */
+$vp-min-width: 320px;
+$vp-max-width: 1200px;
+
+html {
+  // font-family: 'Noto Sans', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, Sans-Serif;
+  // font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", 'Noto Sans', Roboto, Ubuntu, "Helvetica Neue", sans-serif;
+  font-family: 'Noto Sans', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", sans-serif;
+  @include fluid-size($vp-min-width, $vp-max-width, 14px, 16px);
+  font-smoothing: antialiased;
+}
+// html {
+//   font: 1rem/1.6 'Noto Sans', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, Sans-Serif;
+// }
+
+h1,
+h2,
+h3,
+h4 {
+  font-family: 'Roboto';
+  font-weight: normal;
+}
+h1 {
+  @include fluid-size($vp-min-width, $vp-max-width, 27px, 50px);
+}
+h2 {
+  @include fluid-size($vp-min-width, $vp-max-width, 23px, 40px);
+}
+h3 {
+  font-weight: bold;
+  color: $c-font-dim;
+  @include fluid-size($vp-min-width, $vp-max-width, 20px, 30px);
+}
+h4 {
+  color: $c-font-dim;
+  @include fluid-size($vp-min-width, $vp-max-width, 20px, 26px);
+}
diff --git a/ui/common/css/components/_box.scss b/ui/common/css/components/_box.scss
index 95b85058f4..5bf5aa9b66 100644
--- a/ui/common/css/components/_box.scss
+++ b/ui/common/css/components/_box.scss
@@ -1,8 +1,14 @@
 .box {
-  @extend %box-neat;
   background: $c-background-clear;
+  @extend %box-shadow;
 
   &-pad {
     padding: 3vh 3vw;
   }
 }
+
+@include breakpoint($mq-main-margin) {
+  main.box {
+    @include box-radius;
+  }
+}
diff --git a/ui/common/css/components/_site-header.scss b/ui/common/css/components/_site-header.scss
index d44112d184..6b648eb0a5 100644
--- a/ui/common/css/components/_site-header.scss
+++ b/ui/common/css/components/_site-header.scss
@@ -103,6 +103,7 @@ body.dark #clinput input {
 }
 
 #reconnecting {
+  display: none;
   opacity: 0;
 }
 body.offline #reconnecting,
diff --git a/ui/common/css/components/_subnav.scss b/ui/common/css/components/_subnav.scss
index a029ea7899..9ac54ea680 100644
--- a/ui/common/css/components/_subnav.scss
+++ b/ui/common/css/components/_subnav.scss
@@ -14,7 +14,7 @@
       display: flex;
       align-items: center;
       background: $c-background-clear;
-      border-radius: $border-radius;
+      @include box-radius;
       &:hover {
         color: $c-link;
       }
@@ -37,7 +37,7 @@
         border-bottom: 1px solid $c-link;
       }
       &.active {
-        border-radius: 3px 0 0 3px;
+        border-radius: $box-radius-size 0 0 $box-radius-size;
         background: $c-background-clear;
         font-weight: bold;
         box-shadow: $box-shadow;
diff --git a/ui/site/css/_importer.scss b/ui/site/css/_importer.scss
index 10201421bc..48d13dc915 100644
--- a/ui/site/css/_importer.scss
+++ b/ui/site/css/_importer.scss
@@ -29,7 +29,7 @@ main.importer {
     }
 
     & button.submit {
-      margin: 1em auto 0 auto;
+      margin: 0 auto;
       display: block;
     }
 
diff --git a/ui/site/css/_palette.scss b/ui/site/css/_palette.scss
new file mode 100644
index 0000000000..83f72a99be
--- /dev/null
+++ b/ui/site/css/_palette.scss
@@ -0,0 +1,131 @@
+$palette-colors: (
+'background': (
+'dim': $c-background-dim,
+'base': $c-background,
+'clear': $c-background-clear
+),
+'primary': (
+'dim': c-dimmer($c-primary),
+'base': $c-primary,
+'clear': c-clearer($c-primary)
+),
+'secondary': (
+'dim': c-dimmer($c-secondary),
+'base': $c-secondary,
+'clear': c-clearer($c-secondary)
+),
+'accent': (
+'dim': c-dimmer($c-accent),
+'base': $c-accent,
+'clear': c-clearer($c-accent)
+),
+'brag': (
+'dim': c-dimmer($c-brag),
+'base': $c-brag,
+'clear': c-clearer($c-brag)
+),
+'error': (
+'dim': c-dimmer($c-error),
+'base': $c-error,
+'clear': c-clearer($c-error)
+),
+'fancy': (
+'dim': c-dimmer($c-fancy),
+'base': $c-fancy,
+'clear': c-clearer($c-fancy)
+),
+'font': (
+'dim': c-dimmer($c-font),
+'base': $c-font,
+'clear': c-clearer($c-font)
+),
+);
+
+$variant-height: 2.5rem;
+
+.palette {
+  display: grid;
+  grid-column-gap: $block-gap;
+  grid-row-gap: $block-gap;
+  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
+
+  & *,
+  & *:before,
+  & *:after {
+    position: relative;
+  }
+
+  & .color {
+    height: 16rem;
+    display: block;
+    @extend %box-neat;
+
+    &:before, &:after {
+      content: '';
+      position: absolute;
+      display: block;
+      width: 100%;
+      height: 30%;
+      bottom: 0;
+      left: 0;
+      border-top: $borders;
+      padding: 0.5rem;
+      text-transform: uppercase;
+      overflow: hidden;
+    }
+
+    &:before {
+      background-color: $c-background-clear;
+      border-radius: 0 0 $box-radius-size $box-radius-size;
+      font-weight: bold;
+    }
+
+    &:after {
+      padding-top: 2rem;
+      font-size: 80%;
+    }
+
+    @each $color-key, $color-variants in $palette-colors {
+      $base-color-value: map-get($color-variants, 'base');
+
+      &.#{$color-key} {
+        background-color: $base-color-value;
+
+        &:before { content: "#{$color-key}"; }
+        &:after { content: "#{$base-color-value}"; }
+
+        $variant-gradient: (unquote("to bottom"),);
+
+        $index: 0;
+        @each $variant-name, $variant-value in $color-variants {
+          $variant-gradient: append($variant-gradient, $variant-value $index * $variant-height);
+          $index: $index + 1;
+          $variant-gradient: append($variant-gradient, $variant-value $index * $variant-height);
+        }
+
+        .variants {
+          border-left: 1px solid white;
+          border-bottom: 1px solid white;
+          border-radius: 0 0 0 $box-radius-size;
+          position: absolute;
+          height: $variant-height * length($color-variants);
+          width: 60%;
+          right: 0;
+          top: 0;
+          background: linear-gradient(#{$variant-gradient});
+          overflow: hidden;
+          &::before {
+            line-height: 2.5rem;
+            content: 'Zombie ipsum reversus ab viral inferno, nam rick grimes malum cerebro. De carne lumbering animata corpora quaeritis. Summus brains sit​​, morbo vel maleficia? De apocalypsi gorger omero undead survivor dictum mauris.';
+            left: .5rem;
+          }
+          color: #fff;
+        }
+      }
+    }
+    &.background .variants {
+      color: $c-font;
+    }
+  }
+}
+
diff --git a/ui/site/css/build/_palette.scss b/ui/site/css/build/_palette.scss
new file mode 100644
index 0000000000..cb686bce70
--- /dev/null
+++ b/ui/site/css/build/_palette.scss
@@ -0,0 +1,3 @@
+@import '../../../common/css/lichess';
+@import '../../../common/css/components/form3';
+@import '../palette';
diff --git a/ui/site/css/build/palette.dark.scss b/ui/site/css/build/palette.dark.scss
new file mode 100644
index 0000000000..33f132a03d
--- /dev/null
+++ b/ui/site/css/build/palette.dark.scss
@@ -0,0 +1,2 @@
+@import '../../../common/css/themes/dark';
+@import 'palette';
diff --git a/ui/site/css/build/palette.light.scss b/ui/site/css/build/palette.light.scss
new file mode 100644
index 0000000000..a2548e6785
--- /dev/null
+++ b/ui/site/css/build/palette.light.scss
@@ -0,0 +1,2 @@
+@import '../../../common/css/themes/light';
+@import 'palette';
diff --git a/ui/site/css/build/palette.transp.scss b/ui/site/css/build/palette.transp.scss
new file mode 100644
index 0000000000..d7105bad19
--- /dev/null
+++ b/ui/site/css/build/palette.transp.scss
@@ -0,0 +1,2 @@
+@import '../../../common/css/themes/transp';
+@import 'palette';