Change design of interaction modal in web UI (#33278)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/styles/mastodon/components.scss

@@ -8955,6 +8955,7 @@ noscript {
   }
 
   p {
+    text-align: center;
     font-size: 17px;
     line-height: 22px;
     color: $darker-text-color;
@@ -9030,11 +9031,6 @@ noscript {
       border: 1px solid var(--background-border-color);
     }
 
-    &.focused &__input {
-      border-color: $highlight-text-color;
-      background: lighten($ui-base-color, 4%);
-    }
-
     &.invalid &__input {
       border-color: $error-red;
     }