Fixes.

tp-tabs.js

@@ -8,14 +8,12 @@ import { closest } from '@tp/helpers';
 import { LitElement, html, css } from 'lit-element';
 
 class TpTabs extends LitElement {
-  static get properties() {
-    return {
-      orientation: { type: String, reflect: true }
-    };
-  }
-
   static get styles() {
     return css`
+      :host {
+        display: block;
+      }
+
       :host([orientation="vertical"]) .tabs {
         flex-direction: column;
       }
@@ -30,6 +28,12 @@ class TpTabs extends LitElement {
     `;
   }
 
+  static get properties() {
+    return {
+      orientation: { type: String, reflect: true }
+    };
+  }
+
   constructor() {
     super();
     this.orientation = 'horizontal';