WordPress/wp-includes/blocks/spacer/editor.min.css

.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%}.block-library-spacer__resize-container.has-show-handle,.wp-block-spacer.is-hovered .block-library-spacer__resize-container{background:rgba(0,0,0,.1)}.is-dark-theme .block-library-spacer__resize-container.has-show-handle,.is-dark-theme .wp-block-spacer.is-hovered .block-library-spacer__resize-container{background:hsla(0,0%,100%,.15)}.block-library-spacer__resize-container{clear:both}.block-library-spacer__resize-container .components-resizable-box__handle:before{content:none}.block-library-spacer__resize-container.resize-horizontal{margin-bottom:0}