Adjust block button to latest WP Gut version

Author: Cocola

src/scss/components/_buttons.scss

@@ -48,6 +48,7 @@
 // Outline style
 @mixin button--outline($borderColor: $maingrey, $color: $textcolor) {
 	background-color: transparent;
+	border-width: 1px; // Force button width VS Gutenberg CSS
 	border-color: $borderColor;
 	color: $color;
 

src/scss/wp/_gutenberg.scss

@@ -13,9 +13,10 @@
 
     // Block Button
     &-button {
+        margin-bottom: $base-spacing;
+
         &__link {
             @extend .button;
-            @extend .button--round;
 
             &:not([class*="has"]) {
                 @extend .button--primary;