fix(numberinput): fix vertical alignment

fix vertical alignment in safari - add class to numberinput container

src/base_bundle_entry.scss

@@ -30,6 +30,7 @@ $include-typography: true !default;
 @import './elements/tag/tag';
 @import './elements/checkbox/checkbox';
 @import './elements/input/input';
+@import './elements/numberinput/numberinput';
 @import './elements/list/list';
 @import './elements/radio/radio';
 @import './elements/table/table';

src/elements/numberinput/NumberInputPage.jsx

@@ -8,7 +8,7 @@ function NumberInputPage() {
       {theme.map(elem => (
         <div
           key={`key-${elem}`}
-          className={`theme-${elem}`}
+          className={`theme-${elem} zep-numberinput`}
           style={{ marginBottom: 15 }}
           data-zep-type="number-input"
           data-zep-init="true"

src/elements/numberinput/_numberinput.scss

@@ -0,0 +1,11 @@
+@mixin numberinput {
+  .#{$prefix}numberinput {
+    > * {
+      vertical-align: middle;
+    }
+  }
+}
+
+@include exports('numberinput') {
+  @include numberinput;
+}