first commit

wp-includes/blocks/buttons/style.css

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+.wp-block-buttons {
+  box-sizing: border-box;
+}
+.wp-block-buttons.is-vertical {
+  flex-direction: column;
+}
+.wp-block-buttons.is-vertical > .wp-block-button:last-child {
+  margin-bottom: 0;
+}
+.wp-block-buttons > .wp-block-button {
+  display: inline-block;
+  margin: 0;
+}
+.wp-block-buttons.is-content-justification-left {
+  justify-content: flex-start;
+}
+.wp-block-buttons.is-content-justification-left.is-vertical {
+  align-items: flex-start;
+}
+.wp-block-buttons.is-content-justification-center {
+  justify-content: center;
+}
+.wp-block-buttons.is-content-justification-center.is-vertical {
+  align-items: center;
+}
+.wp-block-buttons.is-content-justification-right {
+  justify-content: flex-end;
+}
+.wp-block-buttons.is-content-justification-right.is-vertical {
+  align-items: flex-end;
+}
+.wp-block-buttons.is-content-justification-space-between {
+  justify-content: space-between;
+}
+.wp-block-buttons.aligncenter {
+  text-align: center;
+}
+.wp-block-buttons {
+  /* stylelint-disable @stylistic/indentation -- Disable the stylelint rule, otherwise this selector is ugly! */
+}
+.wp-block-buttons:not(.is-content-justification-space-between,
+.is-content-justification-right,
+.is-content-justification-left,
+.is-content-justification-center) .wp-block-button.aligncenter {
+  /* stylelint-enable @stylistic/indentation */
+  margin-left: auto;
+  margin-right: auto;
+  width: 100%;
+}
+.wp-block-buttons[style*=text-decoration] .wp-block-button,
+.wp-block-buttons[style*=text-decoration] .wp-block-button__link {
+  text-decoration: inherit;
+}
+.wp-block-buttons.has-custom-font-size .wp-block-button__link {
+  font-size: inherit;
+}
+.wp-block-buttons .wp-block-button__link {
+  width: 100%;
+}
+
+.wp-block-button.aligncenter {
+  text-align: center;
+}