How can a class be added to a Svelte component?

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To add a class to a Svelte component, you can add the class attribute to the HTML element or component tag and set the value of the attribute to the desired class name.

For example, if you want to add a class named "my-class" to a component, the code would look like this:

<my-component class="my-class"></my-component>

If you want to add multiple classes, you can separate them with a space:

<my-component class="my-class1 my-class2"></my-component>

You can also dynamically add or remove classes based on some condition using the class directive. For example:

<my-component class:selected={isActive}></my-component>

Here, the "selected" class will be added to the component if the "isActive" variable is true.