I need to keep a sentence not wrapping when the width of the div is smaller than this sentence

```css
.ex1 {
  background-color: #F0F0F0;
  width: 25%;
  word-wrap: normal;
}
```

```html
<div class="ex1">
This is my sentence
</div>
```

The probleme is that properties `overflow-x:visible` or `word-wrap: normal` not working when the sentence contains spaces