drupal/core/modules/layout_builder/css/layout-builder.css

.layout-builder {
  background-color: #fff;
  border: 3px solid #2f91da;
  padding: 1.5em 1.5em 0.5em;
}

.layout-builder__add-section {
  background-color: #f7f7f7;
  width: 100%;
  outline: 2px dashed #979797;
  padding: 1.5em 0;
  text-align: center;
  margin-bottom: 1.5em;
}

.layout-builder__link--add {
  color: #686868;
  border-bottom: none;
  padding-left: 24px;
  background: url(../../../misc/icons/686868/plus.svg) transparent top left / 16px 16px no-repeat;
}

.layout-builder__link--add:hover,
.layout-builder__link--add:active,
.layout-builder__link--add:focus {
  border-bottom-style: none;
  color: #000;
}

.layout-builder__section {
  margin-bottom: 1.5em;
}

.layout-builder__section .ui-sortable-helper {
  background-color: #fff;
  outline: 2px solid #f7f7f7;
}

.layout-builder__section .ui-state-drop {
  background-color: #ffd;
  outline: 2px dashed #fedb60;
  margin: 20px;
  padding: 30px;
}

.layout-builder__region {
  outline: 2px dashed #2f91da;
}

.layout-builder__add-block {
  background-color: #eff6fc;
  padding: 1.5em 0;
  text-align: center;
}

.layout-builder__link--remove {
  position: relative;
  background: url(../../../misc/icons/bebebe/ex.svg) #fff center center / 16px 16px no-repeat;
  border: 1px solid #ccc;
  box-sizing: border-box;
  font-size: 1rem;
  padding: 0;
  height: 26px;
  width: 26px;
  white-space: nowrap;
  text-indent: -9999px;
  display: inline-block;
  border-radius: 26px;
  margin-left: -10px;
  margin-right: 6px;
  z-index: 2;
}

.layout-builder__link--remove:hover {
  background-image: url(../../../misc/icons/787878/ex.svg);
}

.layout-builder-block {
  padding: 1.5em;
  cursor: move;
}

.layout-builder-block [tabindex="-1"] {
  pointer-events: none;
}

.layout-builder__message .messages {
  background-repeat: no-repeat;
}
.layout-builder__message--defaults .messages {
  background-image: url('../images/globe.svg');
}
.layout-builder__message--overrides .messages {
  background-image: url('../images/location.svg');
}

/**
 * @todo Remove Umami specific styling in https://www.drupal.org/node/3043228.
 */
.layout-builder__message .messages .messages__content {
  background: none;
}

.layout-builder-block__content-preview-placeholder-label {
  margin: 0;
  line-height: 1.4;
  font-size: 1.429em;
  text-align: center;
}

.layout-builder--content-preview-disabled .layout-builder-block {
  border-bottom: 2px dashed #979797;
  margin: 0;
}

#drupal-off-canvas .layout-selection li {
  display: block;
  padding-bottom: 1em;
}

#drupal-off-canvas .layout-selection li a {
  display: block;
  padding-top: 0.55em;
}

#drupal-off-canvas .inline-block-create-button {
  display: block;
  padding: 24px;
  padding-left: 44px;
  font-size: 16px;
  color: #eee;
  border-bottom: 1px solid #333;
  background: url(../../../misc/icons/bebebe/plus.svg) transparent 16px no-repeat;
}

#drupal-off-canvas .inline-block-create-button,
#drupal-off-canvas .inline-block-list__item {
  margin: 0 -20px;
  background-color: #444;
}

#drupal-off-canvas .inline-block-create-button:hover,
#drupal-off-canvas .inline-block-list__item:hover {
  background-color: #333;
}

#drupal-off-canvas .inline-block-list {
  margin-bottom: 15px;
}

#drupal-off-canvas .inline-block-list__item {
  display: block;
  padding: 15px 0 15px 25px;
}

.layout-builder__add-section.is-layout-builder-highlighted {
  margin-bottom: calc(1.5em - 8px);
  outline: none;
}
.layout-builder__layout.is-layout-builder-highlighted,
.layout-builder-block.is-layout-builder-highlighted,
.layout-builder__add-block.is-layout-builder-highlighted {
  margin: -4px -2px;
  position: relative;
  z-index: 1;
}
.layout-builder__add-block.is-layout-builder-highlighted,
.layout-builder__add-section.is-layout-builder-highlighted,
.layout-builder__layout.is-layout-builder-highlighted:before,
.layout-builder__layout.is-layout-builder-highlighted,
.layout-builder-block.is-layout-builder-highlighted {
  border: 4px solid #000;
}

/* Highlight the active block in the Move Block dialog. */
#drupal-off-canvas .layout-builder-components-table__block-label--current {
  border-left: solid 5px;
  padding-left: 17px;
}

/**
 * @todo remove in https://www.drupal.org/project/drupal/issues/3042127
 *   This rule ensures the row weight dropdowns in the Move Block dialog
 *   maintain the background color of their container when they are hovered
 *   over or are inside the active row.
 */
#drupal-off-canvas .layout-builder-components-table__row .form-item {
  background-color: transparent;
}

.layout-builder__region-label,
.layout-builder__section-label {
  display: none;
}

.layout-builder--move-blocks-active  .layout-builder__region-label {
  display: block;
}

.layout-builder--move-blocks-active  .layout-builder__section-label {
  display: inline;
}

.layout__region-info {
  padding: 0.5em;
  text-align: center;
  border-bottom: 2px dashed #979797;
}

/**
 * Remove "You have unsaved changes" warning because Layout Builder always has
 * unsaved changes until "Save layout" is submitted.
 * @todo create issue for todo.
 */
.layout-builder-components-table .tabledrag-changed-warning {
  display: none !important;
}