styling fixes:

- fixes padding-top on property layout for all but first item
- fixes whitespace below workspace layout element
- fixes cotent tab background color
- sets first content tab to active on load

src/Umbraco.Web.UI.Client/src/backoffice/documents/documents/workspace/views/document-workspace-view-edit.element.ts

@@ -15,6 +15,7 @@ export class UmbDocumentWorkspaceViewEditElement extends UmbLitElement {
 		css`
 			:host {
 				display: block;
+				--uui-tab-background: var(--uui-color-surface);
 			}
 		`,
 	];
@@ -135,7 +136,7 @@ export class UmbDocumentWorkspaceViewEditElement extends UmbLitElement {
 							? html`
 									<uui-tab
 										label="Content"
-										.active=${this._routerPath === this._activePath}
+										.active=${this._routerPath + '/root' === this._activePath}
 										href=${this._routerPath || ''}
 										>Content</uui-tab
 									>

src/Umbraco.Web.UI.Client/src/backoffice/shared/components/workspace/workspace-layout/workspace-layout.element.ts

@@ -50,10 +50,6 @@ export class UmbWorkspaceLayout extends UmbLitElement {
 				border-right: 1px solid var(--uui-color-border);
 			}
 
-			#router-slot {
-				height: 100%;
-			}
-
 			umb-extension-slot[slot='actions'] {
 				display: flex;
 				gap: var(--uui-size-space-2);

src/Umbraco.Web.UI.Client/src/backoffice/shared/components/workspace/workspace-property-layout/workspace-property-layout.element.ts

@@ -37,11 +37,7 @@ export class UmbWorkspacePropertyLayoutElement extends LitElement {
 				border-bottom: none;
 			}
 
-			:host(:first-of-type) {
-				padding-top: 0;
-			}
-
-			:host(:first-of-type) {
+			:host-context(umb-variantable-property:first-of-type) {
 				padding-top:0;
 			}