👍 icon,twitterを追加

scss/icons/_index.scss

@@ -0,0 +1,3 @@
+@charset "utf-8";
+
+@import "icons.scss";

scss/icons/icons.scss

@@ -0,0 +1,43 @@
+@import "pixelize.scss";
+@import "twitter.scss";
+
+@mixin setup($pixel) {
+  $size: $pixel * 16;
+
+  width: $size;
+  height: $size;
+
+  &::before {
+    top: $pixel * -1;
+    left: $pixel * -1;
+    width: $pixel;
+    height: $pixel;
+  }
+
+  &.-twitter::before {
+    @include pixelize($twitter, $pixel, #1c9ceb);
+  }
+}
+
+.icon {
+  position: relative;
+  display: inline-block;
+
+  &::before {
+    position: absolute;
+    display: block;
+    content: "";
+    background: transparent;
+  }
+
+  // -default
+  @include setup(2px);
+
+  &.-medium {
+    @include setup(3px);
+  }
+
+  &.-large {
+    @include setup(4px);
+  }
+}

scss/icons/pixelize.scss

@@ -0,0 +1,21 @@
+@mixin pixelize($matrix, $size, $color) {
+  $ret: "";
+
+  @for $i from 1 through length($matrix) {
+    $row: nth($matrix, $i);
+
+    @for $j from 1 through length($row) {
+      $dot: nth($row, $j);
+
+      @if $dot != 0 {
+        @if $ret != "" {
+          $ret: $ret + ",";
+        }
+
+        $ret: $ret + ($j * $size) + " " + ($i * $size) + " 0 " + $color;
+      }
+    }
+  }
+
+  box-shadow: unquote($ret + ";");
+}

scss/icons/twitter.scss

@@ -0,0 +1,19 @@
+// prettier-ignore
+$twitter: (
+  ( 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ),
+  ( 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ),
+  ( 1,0,1,1,1,1,1,1,1,0,0,0,1,1,1,1 ),
+  ( 1,0,0,0,1,1,1,1,0,0,0,0,0,1,1,1 ),
+  ( 1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1 ),
+  ( 1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1 ),
+  ( 1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1 ),
+  ( 1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1 ),
+  ( 1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,1 ),
+  ( 1,1,1,1,0,0,0,0,0,0,0,0,1,1,1,1 ),
+  ( 1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1 ),
+  ( 1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1 ),
+  ( 1,1,0,0,0,0,0,0,0,1,1,1,1,1,1,1 ),
+  ( 1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1 ),
+  ( 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 ),
+  ( 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 )
+);

scss/nes.scss

@@ -6,3 +6,4 @@
 
 @import "base/_index.scss";
 @import "elements/_index.scss";
+@import "icons/_index.scss";