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You should almost _never_ use a `style` attribute. They're clunky, they mix HTML with CSS meaning you can't preload it, and they override just about everything else.

Instead, either use atomic classes from Co-Design, or if that doesn't work add a class of your own and write some custom CSS.

In this case, perhaps try something like this:

```js
// JavaScript
$tgt.addClass('failed-validation');
```

```css
/* CSS, app/assets/stylesheets/character_count.scss */
.failed-validation {
  border: 2px solid #d21919 !important;
}
```