adds default image width

config/module.config.php

@@ -21,7 +21,7 @@ return [
         'SmartGalleryBlockForm' => [
             'title' => '',
             'renderSourceLink' => true,
-            'width' => 600,
+            'width' => 200,
             'wrapStyle' => 'overflow-y: hidden;display: flex;flex-direction: column;justify-content: center;',
         ]
     ]

src/Form/SmartGalleryBlockForm.php

@@ -10,6 +10,14 @@ class SmartGalleryBlockForm extends Form
 	public function init()
 	{
 
+		$this->add([
+			'name' => 'o:block[__blockIndex__][o:data][width]',
+      'type' => Element\Text::class,
+      'options' => [
+          'label' => 'Individual image width (px)',
+      ],
+		]);
+
 		$this->add([
 		    'type' => Element\Checkbox::class,
 		    'name' => 'o:block[__blockIndex__][o:data][renderSourceLink]',

src/Site/BlockLayout/SmartGallery.php

@@ -48,6 +48,7 @@ class SmartGallery extends AbstractBlockLayout
 			: $this->defaultSettings;
 		$form->setData([
 			'o:block[__blockIndex__][o:data][title]' => $data['title'],
+			'o:block[__blockIndex__][o:data][width]' => $data['width'],
       'o:block[__blockIndex__][o:data][renderSourceLink]' => $data['renderSourceLink'],
 		]);
 		$form->prepare();
@@ -103,6 +104,7 @@ class SmartGallery extends AbstractBlockLayout
       'gallery_id' => 'ig_' . ++$gallery_id,
 			'title' => $block->dataValue('title'),
       'images' => $images,
+      'width' => $block->dataValue('width'),
       'renderSourceLink' => $block->dataValue('renderSourceLink'),
 		]);
 	}

view/common/block-layout/smartGallery.phtml

@@ -30,7 +30,7 @@ $this->headLink()->appendStylesheet($this->assetUrl('css/style.css',
     		<img src="<?= $image['media_url'] ?>"
     				 alt=""
     				 item_url="<?= $image['item_url'] ?>"
-             width="250"
+             width="<?= $width ?>"
     		/>
         </a>
       </div>