diff --git a/changelog.md b/changelog.md
index 1a61b4a..4ea8d89 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,9 @@
+# changelog v4.3.4 (27 août 2015)
+
+- ajout des classes `.pull` et `.push` pour les offsets des grilles
+- corrections de la doc Print et Commencer
+- corrections de nommages reliquats : `.flexitem-double` -> `.flex-item-double`
+
 # changelog v4.3.3 (6 août 2015)
 
 - ajout de helpers (breakpoints responsive)
diff --git a/less/_03-grids.less b/less/_03-grids.less
index 632860e..a8441ca 100644
--- a/less/_03-grids.less
+++ b/less/_03-grids.less
@@ -4,37 +4,35 @@
 
 // Tuto : http://www.alsacreations.com/tuto/lire/1659-une-grille-responsive-avec-flexbox-et-LESS.html
 // Demo : http://codepen.io/raphaelgoetter/pen/zxBMLW
-
 // Usage in vanilla CSS:
 // - <div class="grid-4"> for an equal fourth columns grid container
 // - <div class="grid-2-1"> for an uneven columns grid container
-
 // Usage with preprocessors : if you're using LESS, you can config grids variables :
 // n = number of columns (default = 4)
 // example : .grid-perso { .grid(12); }
 // ... or uneven grids :
 // left = left ratio column (default = 2) / right = right ratio column (default = 1)
 // example : .grid-perso { .uneven-grid(2, 1); }
-
 /* grid container */
+
 [class*="@{kna-namespace}grid-"] {
   display: flex;
   flex-direction: row;
   flex-wrap: wrap;
   margin-left: -@gutter;
-
   /* inline-block fallback for IE9 generation */
+  
   letter-spacing: -0.31em;
   text-rendering: optimizespeed;
 }
-
 /* grid childs */
+
 [class*="@{kna-namespace}grid-"] > * {
   flex: 0 0 auto;
   width: ~'calc(100% * 1 / @{number} - @{gutter} - .01px)';
   margin-left: @gutter;
-
   /* inline-block fallback for IE9 generation */
+  
   display: inline-block;
   vertical-align: top;
   letter-spacing: normal;
@@ -43,11 +41,15 @@
 
 // LESS mixins for *equal* columns grid container
 // example : .grid-perso { .grid(12); }
-.grid(@number:@number, @gutter:@gutter) {
+.grid(@number: @number,
+@gutter: @gutter) {
   & > * {
     width: ~'calc(100% * 1 / @{number} - @{gutter} - .01px)';
   }
-  & > .@{kna-namespace}flex-item-double {
+  & > .@ {
+    kna-namespace
+  }
+  flex-item-double {
     width: ~'calc(100% * 2 / @{number} - @{gutter} - .01px)';
   }
 }
@@ -56,81 +58,92 @@
 [class*="@{kna-namespace}grid-2"] {
   .grid(2);
 }
+
 [class*="@{kna-namespace}grid-3"] {
   .grid(3);
 }
+
 [class*="@{kna-namespace}grid-4"] {
   .grid(4);
 }
+
 [class*="@{kna-namespace}grid-5"] {
   .grid(5);
 }
+
 [class*="@{kna-namespace}grid-6"] {
   .grid(6);
 }
+
 [class*="@{kna-namespace}grid-7"] {
   .grid(7);
 }
+
 [class*="@{kna-namespace}grid-8"] {
   .grid(8);
 }
+
 [class*="@{kna-namespace}grid-10"] {
   .grid(10);
 }
+
 [class*="@{kna-namespace}grid-12"] {
   .grid(12);
 }
-
 /* Responsive grid */
+
 // "small-2" = 2 columns when small screen
 // example : .grid-4-small-2 will be 4 then 2 columns
 @media (max-width: @small-screen) {
   [class*="-small-4"] > * {
     width: ~'calc(100% * 1 / 4 - @{gutter} - .01px)';
   }
-  [class*="-small-4"] > .flexitem-double {
+  [class*="-small-4"] > .flex-item-double {
     width: ~'calc(100% * 1 / 2 - @{gutter} - .01px)';
   }
   [class*="-small-3"] > * {
     width: ~'calc(100% * 1 / 3 - @{gutter} - .01px)';
   }
-  [class*="-small-3"] > .flexitem-double {
+  [class*="-small-3"] > .flex-item-double {
     width: ~'calc(100% * 2 / 3 - @{gutter} - .01px)';
   }
   [class*="-small-2"] > * {
     width: ~'calc(100% * 1 / 2 - @{gutter} - .01px)';
   }
-  [class*="-small-2"] > .flexitem-double {
+  [class*="-small-2"] > .flex-item-double {
     width: ~'calc(100% - @{gutter} - .01px)';
   }
   [class*="-small-1"] > * {
     width: ~'calc(100% - @{gutter} - .01px)';
   }
-  [class*="-small-1"] > .flexitem-double {
+  [class*="-small-1"] > .flex-item-double {
     width: ~'calc(100% - @{gutter} - .01px)';
   }
 }
+
 // "tiny-1" = 1 column when tiny screen
 // example : .grid-4-small-2-tiny-1 will be 4 then 2 columns then 1 column
 @media (max-width: @tiny-screen) {
   [class*="-tiny-2"] > * {
     width: ~'calc(100% * 1 / 2 - @{gutter} - .01px)';
   }
-  [class*="-tiny-2"] > .flexitem-double {
+  [class*="-tiny-2"] > .flex-item-double {
     width: ~'calc(100% - @{gutter} - .01px)';
   }
   [class*="-tiny-1"] > * {
     width: ~'calc(100% - @{gutter} - .01px)';
   }
-  [class*="-tiny-1"] > .flexitem-double {
+  [class*="-tiny-1"] > .flex-item-double {
     width: ~'calc(100% - @{gutter} - .01px)';
   }
 }
 
 // LESS mixins for *unequal* columns grid container
 // example : .grid-perso { .uneven-grid(2, 1); }
-.uneven-grid(@left:@left, @right:@right, @gutter:@gutter) {
-  & > *:nth-child(odd) {
+.uneven-grid(@left: @left,
+@right: @right,
+@gutter: @gutter) {
+  & > *: nth-child(odd) {
     @size: (@left / (@left + @right)) * 100%;
     width: ~'calc(@{size} - @{gutter} - .01px)';
   }
@@ -139,42 +152,89 @@
     width: ~'calc(@{size} - @{gutter} - .01px)';
   }
   @media (max-width: @small-screen) {
-    & > *:nth-child(n) {
+    & > *: nth-child(n) {
       width: ~'calc(100% - @{gutter} - .01px)';
     }
   }
 }
 
 // Examples : will be compiled in CSS
-.@{kna-namespace}grid-2-1 {
-  .uneven-grid(2,1);
-}
-.@{kna-namespace}grid-1-2 {
-  .uneven-grid(1,2);
-}
-.@{kna-namespace}grid-3-1 {
-  .uneven-grid(3,1);
-}
-.@{kna-namespace}grid-1-3 {
-  .uneven-grid(1,3);
-}
-.@{kna-namespace}grid-3-2 {
-  .uneven-grid(3,2);
-}
-.@{kna-namespace}grid-2-3 {
-  .uneven-grid(2,3);
-}
-.@{kna-namespace}grid-4-1 {
-  .uneven-grid(4,1);
-}
-.@{kna-namespace}grid-1-4 {
-  .uneven-grid(1,4);
+.@ {
+  kna-namespace
 }
 
-.@{kna-namespace}pull {
+grid-2-1 {
+  .uneven-grid(2, 1);
+}
+
+.@ {
+  kna-namespace
+}
+
+grid-1-2 {
+  .uneven-grid(1, 2);
+}
+
+.@ {
+  kna-namespace
+}
+
+grid-3-1 {
+  .uneven-grid(3, 1);
+}
+
+.@ {
+  kna-namespace
+}
+
+grid-1-3 {
+  .uneven-grid(1, 3);
+}
+
+.@ {
+  kna-namespace
+}
+
+grid-3-2 {
+  .uneven-grid(3, 2);
+}
+
+.@ {
+  kna-namespace
+}
+
+grid-2-3 {
+  .uneven-grid(2, 3);
+}
+
+.@ {
+  kna-namespace
+}
+
+grid-4-1 {
+  .uneven-grid(4, 1);
+}
+
+.@ {
+  kna-namespace
+}
+
+grid-1-4 {
+  .uneven-grid(1, 4);
+}
+
+.@ {
+  kna-namespace
+}
+
+pull {
   margin-right: auto;
 }
 
-.@{kna-namespace}push {
-  margin-left: auto;
+.@ {
+  kna-namespace
 }
+
+push {
+  margin-left: auto;
+}
\ No newline at end of file
diff --git a/sass/_03-grids.scss b/sass/_03-grids.scss
index 1924ad6..3993146 100644
--- a/sass/_03-grids.scss
+++ b/sass/_03-grids.scss
@@ -4,37 +4,41 @@
 
 // Tuto : http://www.alsacreations.com/tuto/lire/1659-une-grille-responsive-avec-flexbox-et-LESS.html
 // Demo : http://codepen.io/raphaelgoetter/pen/ZYjwEB
-
 // Usage in vanilla CSS:
 // - <div class="grid-4"> for an equal fourth columns grid container
 // - <div class="grid-2-1"> for an uneven columns grid container
-
 // Usage with preprocessors : if you're using Sass, you can config grids variables :
 // n = number of columns (default = 4) / g = gutter value (default = 1em)
 // example : .grid-perso { @include grid(12, 10px); }
 // ... or uneven grids :
 // left = left ratio column (default = 2) / right = right ratio column (default = 1)
 // example : .grid-perso { @include uneven-grid(2, 1, 10px); }
-
 /* grid container */
+
 [class*="#{$kna-namespace}grid-"] {
   display: flex;
   flex-direction: row;
   flex-wrap: wrap;
   margin-left: -$gutter;
-
   /* inline-block fallback for IE9 generation */
+  
   letter-spacing: -0.31em;
   text-rendering: optimizespeed;
 }
-
 /* grid childs */
+
 [class*="#{$kna-namespace}grid-"] > * {
   flex: 0 0 auto;
-  width: calc(100% * 1 / #{$number} - #{$gutter} - .01px);
+  width: calc(100% * 1 / # {
+    $number
+  }
+  - # {
+    $gutter
+  }
+  - .01px);
   margin-left: $gutter;
-
   /* inline-block fallback for IE9 generation */
+  
   display: inline-block;
   vertical-align: top;
   letter-spacing: normal;
@@ -43,17 +47,32 @@
 
 // Sass mixins for *equal* columns grid container
 // example : .grid-perso { @include grid(12); }
-@mixin grid($number:$number,$gutter:$gutter) {
+@mixin grid($number:$number,
+$gutter:$gutter) {
   & > * {
-    width: calc(100% * 1 / #{$number} - #{$gutter} - .01px);
+    width: calc(100% * 1 / # {
+      $number
+    }
+    - # {
+      $gutter
+    }
+    - .01px);
   }
-  & > .#{$kna-namespace}flex-item-double {
-    width: calc(100% * 2 / #{$number} - #{$gutter});
+  & > .# {
+    $kna-namespace
+  }
+  flex-item-double {
+    width: calc(100% * 2 / # {
+      $number
+    }
+    - # {
+      $gutter
+    }
+    );
   }
 }
 
 // Examples : will be compiled in CSS
-
 [class*="#{$kna-namespace}grid-2"] {
   @include grid(2);
 }
@@ -89,111 +108,202 @@
 [class*="#{$kna-namespace}grid-12"] {
   @include grid(12);
 }
-
 /* Responsive grid */
+
 // "small-2" = 2 columns when small screen
 // example : .grid-4-small-2 will be 4 then 2 columns
 @media (max-width: $small-screen) {
   [class*="-small-4"] > * {
-    width: calc(100% * 1 / 4 - #{$gutter} - .01px);
+    width: calc(100% * 1 / 4 - # {
+      $gutter
+    }
+    - .01px);
   }
-  [class*="-small-4"] > .flexitem-double {
-    width: calc(100% * 1 / 2 - #{$gutter} - .01px);
+  [class*="-small-4"] > .flex-item-double {
+    width: calc(100% * 1 / 2 - # {
+      $gutter
+    }
+    - .01px);
   }
   [class*="-small-3"] > * {
-    width: calc(100% * 1 / 3 - #{$gutter} - .01px);
+    width: calc(100% * 1 / 3 - # {
+      $gutter
+    }
+    - .01px);
   }
-  [class*="-small-3"] > .flexitem-double {
-    width: calc(100% * 2 / 3 - #{$gutter} - .01px);
+  [class*="-small-3"] > .flex-item-double {
+    width: calc(100% * 2 / 3 - # {
+      $gutter
+    }
+    - .01px);
   }
   [class*="-small-2"] > * {
-    width: calc(100% * 1 / 2 - #{$gutter} - .01px);
+    width: calc(100% * 1 / 2 - # {
+      $gutter
+    }
+    - .01px);
   }
-  [class*="-small-2"] > .flexitem-double {
-    width: calc(100% - #{$gutter} - .01px);
+  [class*="-small-2"] > .flex-item-double {
+    width: calc(100% - # {
+      $gutter
+    }
+    - .01px);
   }
   [class*="-small-1"] > * {
-    width: calc(100% - #{$gutter} - .01px);
+    width: calc(100% - # {
+      $gutter
+    }
+    - .01px);
   }
-  [class*="-small-1"] > .flexitem-double {
-    width: calc(100% - #{$gutter} - .01px);
+  [class*="-small-1"] > .flex-item-double {
+    width: calc(100% - # {
+      $gutter
+    }
+    - .01px);
   }
 }
+
 // "tiny-1" = 1 column when tiny screen
 // example : .grid-4-small-2-tiny-1 will be 4 then 2 columns then 1 column
 @media (max-width: $tiny-screen) {
   [class*="-tiny-2"] > * {
-    width: calc(100% * 1 / 2 - #{$gutter} - .01px);
+    width: calc(100% * 1 / 2 - # {
+      $gutter
+    }
+    - .01px);
   }
-  [class*="-tiny-2"] > .flexitem-double {
-    width: calc(100% - #{$gutter} - .01px);
+  [class*="-tiny-2"] > .flex-item-double {
+    width: calc(100% - # {
+      $gutter
+    }
+    - .01px);
   }
   [class*="-tiny-1"] > * {
-    width: calc(100% - #{$gutter} - .01px);
+    width: calc(100% - # {
+      $gutter
+    }
+    - .01px);
   }
-  [class*="-tiny-1"] > .flexitem-double {
-    width: calc(100% - #{$gutter} - .01px);
+  [class*="-tiny-1"] > .flex-item-double {
+    width: calc(100% - # {
+      $gutter
+    }
+    - .01px);
   }
 }
 
 // LESS mixins for *unequal* columns grid container
 // example : .grid-perso { @include uneven-grid(2, 1); }
-@mixin uneven-grid($left:$left, $right:$right, $gutter:$gutter) {
-  & > *:nth-child(odd) {
+@mixin uneven-grid($left:$left,
+$right:$right,
+$gutter:$gutter) {
+  & > *: nth-child(odd) {
     $size: ($left / ($left + $right)) * 100%;
-    width: calc(#{$size} - #{$gutter});
+    width: calc(# {
+      $size
+    }
+    - # {
+      $gutter
+    }
+    );
   }
   & > *:nth-child(even) {
     $size: ($right / ($left + $right)) * 100%;
-    width: calc(#{$size} - #{$gutter});
+    width: calc(# {
+      $size
+    }
+    - # {
+      $gutter
+    }
+    );
   }
   @media (max-width: $small-screen) {
-    & > *:nth-child(n) {
-      width: calc(100% - #{$gutter});
+    & > *: nth-child(n) {
+      width: calc(100% - # {
+        $gutter
+      }
+      );
     }
   }
 }
 
-
 // Examples : will be compiled in CSS
-
-.#{$kna-namespace}grid-2-1 {
-  @include uneven-grid(2,1);
+.# {
+  $kna-namespace
 }
 
-.#{$kna-namespace}grid-1-2 {
-  @include uneven-grid(1,2);
+grid-2-1 {
+  @include uneven-grid(2, 1);
 }
 
-.#{$kna-namespace}grid-3-1 {
-  @include uneven-grid(3,1);
+.# {
+  $kna-namespace
 }
 
-.#{$kna-namespace}grid-1-3 {
-  @include uneven-grid(1,3);
+grid-1-2 {
+  @include uneven-grid(1, 2);
 }
 
-.#{$kna-namespace}grid-3-2 {
-  @include uneven-grid(3,2);
+.# {
+  $kna-namespace
 }
 
-.#{$kna-namespace}grid-2-3 {
-  @include uneven-grid(2,3);
+grid-3-1 {
+  @include uneven-grid(3, 1);
 }
 
-.#{$kna-namespace}grid-4-1 {
-  @include uneven-grid(4,1);
+.# {
+  $kna-namespace
 }
 
-.#{$kna-namespace}grid-1-4 {
-  @include uneven-grid(1,4);
+grid-1-3 {
+  @include uneven-grid(1, 3);
 }
 
-.#{$kna-namespace}pull {
+.# {
+  $kna-namespace
+}
+
+grid-3-2 {
+  @include uneven-grid(3, 2);
+}
+
+.# {
+  $kna-namespace
+}
+
+grid-2-3 {
+  @include uneven-grid(2, 3);
+}
+
+.# {
+  $kna-namespace
+}
+
+grid-4-1 {
+  @include uneven-grid(4, 1);
+}
+
+.# {
+  $kna-namespace
+}
+
+grid-1-4 {
+  @include uneven-grid(1, 4);
+}
+
+.# {
+  $kna-namespace
+}
+
+pull {
   margin-right: auto;
 }
 
-.#{$kna-namespace}push {
-  margin-left: auto;
+.# {
+  $kna-namespace
 }
 
+push {
+  margin-left: auto;
+}
\ No newline at end of file