# How to: Use a CSS Selector

CSS Styling for an image within a custom field. Useful for dynamic images that are various sizes.

Use a selector to set dimensions for specific HTML entities such as `div.class1 img`

{% code title="template.html" %}

```html
<style type="text/css">div.class1{
  max-width: 400px;
  max-height: 400px
}

div.class1 img {
  width: 100%;
  height: 100%;
}
</style>
<div class="class1">{{{!Objectname.fieldname}}}</div>
```

{% endcode %}

### Understanding the Source

In the above code block we provide our \<div> with a class **class1.**

```
<div class="class1">{{{!Objectname.fieldname}}}</div>
```

The template is being populated with an image stored in a field, meaning we have a rich text field that will require 3 curly braces. The Selector will set the width and height of any image \<img> to its full value that is found within a \<div> with class **class1.**

<figure><img src="/files/ZPULNhlIJUnfwaZVKACF" alt=""><figcaption></figcaption></figure>


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