diff --git a/public/404.html b/public/404.html
index 0cb83cae..11e11d63 100644
--- a/public/404.html
+++ b/public/404.html
@@ -4,6 +4,7 @@
   <meta charset="utf-8">
   <title>Page not found</title>
   <meta name="viewport" content="width=device-width,initial-scale=1">
+  <meta name="theme-color" content="#f0edf4">
   <style>
     :root {
       --primary: #5e35b1;
@@ -121,7 +122,7 @@
           srcset="/images/errors/small/404.png 576w,
                   /images/errors/medium/404.png 768w,
                   /images/errors/original/404.png 1200w">
-        <img src="/images/errors/small/404.png"/>
+        <img src="/images/errors/small/404.png" alt="A raccoon peeking out of a bin, looking confused" />
       </picture>
     </div>
     <div class="error-text-container">
diff --git a/public/422.html b/public/422.html
index a896d280..a066a6aa 100644
--- a/public/422.html
+++ b/public/422.html
@@ -121,7 +121,7 @@
           srcset="/images/errors/small/404.png 576w,
                   /images/errors/medium/404.png 768w,
                   /images/errors/original/404.png 1200w">
-        <img src="/images/errors/small/404.png"/>
+        <img src="/images/errors/small/404.png" alt="A raccoon peeking out of a bin, looking confused" />
       </picture>
     </div>
     <div class="error-text-container">
diff --git a/public/500.html b/public/500.html
index 74a13003..8557ac4d 100644
--- a/public/500.html
+++ b/public/500.html
@@ -121,7 +121,7 @@
           srcset="/images/errors/small/500.png 576w,
                   /images/errors/medium/500.png 768w,
                   /images/errors/original/500.png 1200w">
-        <img src="/images/errors/small/500.png"/>
+        <img src="/images/errors/small/500.png" alt="A raccoon smashing a server with a hammer" />
       </picture>
     </div>
     <div class="error-text-container">