adds width option in percentage

Module.php

@@ -22,6 +22,13 @@ class Module extends AbstractModule
 			*/
 	];
 
+	const MODEL_WIDTH = [
+			'50' => '50 %',
+			'75' => '75 %',
+			'100' => '100 %',
+	];
+
+
 	public function getConfig()
 	{
 		return include __DIR__ . '/config/module.config.php';

src/Form/Render3DBlockForm.php

@@ -22,13 +22,11 @@ class Render3DBlockForm extends Form
 
 		$this->add([
 			'name' => 'o:block[__blockIndex__][o:data][width]',
-			'type' => Element\Number::class,
+      'type' => Element\Select::class,
       'options' => [
-				'label' => 'Width in pixels',
-			],
-			'attributes' => [
-				'min' => '100',
-			],
+          'label' => 'Width',
+					'value_options' => Module::MODEL_WIDTH,
+      ],
 		]);
 
 		$this->add([