Change default font size

sass/elements/button.sass

@@ -45,9 +45,9 @@ $button-shadow-inset: inset 0 1px 2px rgba($black, 0.2) !default
       width: 1.5em
     &:first-child:not(:last-child)
       margin-left: calc(-0.375em - 1px)
-      margin-right: 0.375em
+      margin-right: 0.1875em
     &:last-child:not(:first-child)
-      margin-left: 0.375em
+      margin-left: 0.1875em
       margin-right: calc(-0.375em - 1px)
     &:first-child:last-child
       margin-left: calc(-0.375em - 1px)
@@ -154,5 +154,9 @@ $button-shadow-inset: inset 0 1px 2px rgba($black, 0.2) !default
       +center(1em)
       position: absolute !important
 
-button.button
+// Adjustment for vertical spacing
+button.button,
+input[type="submit"].button
   line-height: 1
+  padding-bottom: 0.4em
+  padding-top: 0.35em

sass/elements/form.sass

@@ -158,7 +158,6 @@ $input-radius:              $radius !default
     &.is-#{$name}
       color: $color
 
-input[type="submit"].input,
 .select select
   line-height: 1