diff --git a/src/components/ha-tab.ts b/src/components/ha-tab.ts
index 42583e8986..4e0f33758f 100644
--- a/src/components/ha-tab.ts
+++ b/src/components/ha-tab.ts
@@ -99,6 +99,7 @@ export class HaTab extends LitElement {
         display: flex;
         flex-direction: column;
         text-align: center;
+        box-sizing: border-box;
         align-items: center;
         justify-content: center;
         height: var(--header-height);