diff --git a/public/robots.txt b/public/robots.txt
index e3ffe3b..e9e57dc 100644
--- a/public/robots.txt
+++ b/public/robots.txt
@@ -1 +1,3 @@
-Allow: *
\ No newline at end of file
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index 9070ba6..8bd01e0 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -16,7 +16,7 @@ const ChangeTheme: FC = () => {
   const Icon = isDark ? IconSunFilled : IconMoon
 
   return (
-    <button onClick={() => setTheme(isDark ? "light" : "dark")}>
+    <button onClick={() => setTheme(isDark ? "light" : "dark")} aria-label="switch theme">
       <Icon className="h-5 w-5 hover:text-blue-500 dark:hover:text-yellow-500" />
     </button>
   )
@@ -57,7 +57,7 @@ export const Header: FC = () => {
     <header className="flex h-[64px] items-center justify-between">
       <div className="flex items-center gap-5 pl-1.5">
         <a href="/" className="flex items-center gap-2 text-xl font-bold text-primary">
-          <img src="logo.svg" className="h-[24px] w-[24px] rounded" />
+          <img src="logo.svg" alt="logo" className="h-[24px] w-[24px] rounded" />
           TimeWiz.cc
         </a>
 
diff --git a/src/components/Tabs.tsx b/src/components/Tabs.tsx
index bd49d2a..88a0cd6 100644
--- a/src/components/Tabs.tsx
+++ b/src/components/Tabs.tsx
@@ -94,6 +94,7 @@ export const Tabs: FC = () => {
 
       <button
         key="add"
+        aria-label="add tab"
         onClick={addTab}
         className={clsx(
           "mx-1 flex h-6 w-6 items-center justify-center rounded-full hover:bg-gray-200",
diff --git a/src/components/ui/Button.tsx b/src/components/ui/Button.tsx
index dea8db4..80a8216 100644
--- a/src/components/ui/Button.tsx
+++ b/src/components/ui/Button.tsx
@@ -23,6 +23,7 @@ export const Button: FC<ButtonProps> = (props) => {
 
   return (
     <button
+      aria-label="select date"
       className={clsx(
         "flex items-center gap-1 text-nowrap rounded border",
         sizes[size],