By default, IconCaptcha includes 2 themes: light and dark. These themes have been designed in such a way that they seamlessly blend with a wide range of website designs.

To register your custom theme, you need to configure it in the configuration (check the themes option). For each custom theme, you must provide an icon color and an icon separator color. The following example code demonstrates the registration of a custom theme named black.

<?php
    return [
        ...
        // Configurations for additional custom themes.
        'themes' => [
            'black' => [
                // Specifies which icon type should be used: light or dark.
                'iconStyle' => 'light',
                // Specifies the RGB color of the icon separator.
                'separatorColor' => [20, 20, 20],
            ],
        ],
        ...
    ]);
?>

The icons used in this project are made by BlendIcons, and in particular, their Light icon set is used. When adding additional icons, ensure they have a dimension of 30x30 and are in True color format. In total, IconCaptcha comes with 250 icons and you have the flexibility to add your own.

By default, the icon theme colors light and dark are available. The icons can be found in the /dist/icons folder of the client-side package, or the /assets/icons folder of the PHP package. If you wish to add any other icon color, you must copy all the icons from either the light or dark folder to a new folder, and use photo editing software to change the icons into your desired color. You may also download the custom collection of icons directly from their website.

For reference:

• Captcha theme light uses the light icon set, which contains black icons.
• Captcha theme dark uses the dark icon set, which contains white icons.