How to Set width for dropdown in magento2 system configuration?

Question

I have created a custom configuration same like Magento\Braintree\Block\Adminhtml\Form\Field\Countrycreditcard.php with some fields like

$this->addColumn(
            'field',
            ['label' => __('Field'), 'renderer' => $this->_getAttributesRenderer(),'style' => 'width: 1000px']
        );

Even if i set width in style its not working.

Please let me know how to set width.

Answer 1

In

Magento\Braintree\Block\Adminhtml\Form\Field\Cctypes.php` `_toHtml

has

$this->setExtraParams('multiple="multiple"');

So with same function try to set width

setExtraParams('style="width:1000px;"');

setExtraParams function accepts any styling or other attributes we can set for select field