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wp-includes/blocks/spacer/editor.css

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+/**
+ * Colors
+ */
+/**
+ * SCSS Variables.
+ *
+ * Please use variables from this sheet to ensure consistency across the UI.
+ * Don't add to this sheet unless you're pretty sure the value will be reused in many places.
+ * For example, don't add rules to this sheet that affect block visuals. It's purely for UI.
+ */
+/**
+ * Fonts & basic variables.
+ */
+/**
+ * Typography
+ */
+/**
+ * Grid System.
+ * https://make.wordpress.org/design/2019/10/31/proposal-a-consistent-spacing-system-for-wordpress/
+ */
+/**
+ * Radius scale.
+ */
+/**
+ * Elevation scale.
+ */
+/**
+ * Dimensions.
+ */
+/**
+ * Mobile specific styles
+ */
+/**
+ * Editor styles.
+ */
+/**
+ * Block & Editor UI.
+ */
+/**
+ * Block paddings.
+ */
+/**
+ * React Native specific.
+ * These variables do not appear to be used anywhere else.
+ */
+.block-editor-block-list__block[data-type="core/spacer"]::before {
+  content: "";
+  display: block;
+  position: absolute;
+  z-index: 1;
+  width: 100%;
+  min-height: 8px;
+  min-width: 8px;
+  height: 100%;
+}
+
+.wp-block-spacer.is-hovered .block-library-spacer__resize-container,
+.block-library-spacer__resize-container.has-show-handle,
+.wp-block-spacer.is-selected.custom-sizes-disabled {
+  background: rgba(0, 0, 0, 0.1);
+}
+.is-dark-theme .wp-block-spacer.is-hovered .block-library-spacer__resize-container,
+.is-dark-theme .block-library-spacer__resize-container.has-show-handle,
+.is-dark-theme .wp-block-spacer.is-selected.custom-sizes-disabled {
+  background: rgba(255, 255, 255, 0.15);
+}
+
+.block-library-spacer__resize-container {
+  clear: both;
+}
+.block-library-spacer__resize-container:not(.is-resizing) {
+  height: 100% !important;
+  width: 100% !important;
+}
+.block-library-spacer__resize-container .components-resizable-box__handle::before {
+  content: none;
+}
+.block-library-spacer__resize-container.resize-horizontal {
+  margin-bottom: 0;
+  height: 100% !important;
+}