.class moved to block from phtml

Author: srsathish92

app/code/Magento/Tax/Block/Adminhtml/Rate/Form.php

@@ -211,7 +211,12 @@ protected function _prepareForm()
         $fieldset->addField(
             'zip_is_range',
             'checkbox',
-            ['name' => 'zip_is_range', 'label' => __('Zip/Post is Range'), 'value' => '1']
+            [
+                'name' => 'zip_is_range',
+                'label' => __('Zip/Post is Range'),
+                'value' => '1',
+                'class' => 'zip-is-range-checkbox'
+            ]
         );
 
         if (!isset($formData['tax_postcode'])) {

app/code/Magento/Tax/view/adminhtml/templates/rate/form.phtml

@@ -4,7 +4,7 @@
  * See COPYING.txt for license details.
  */
 ?>
-<div class="entry-edit form-inline tax-rate-form">
+<div class="entry-edit form-inline">
     <?= $block->getFormHtml() ?>
 </div>
 <?= $block->getChildHtml('form_after') ?>

app/design/adminhtml/Magento/backend/Magento_Tax/web/css/source/_module.less

@@ -26,10 +26,8 @@
     }
 }
 
-.tax-rate-form {
-    .admin__fieldset > .admin__field > .admin__field-control {
-        input[type='checkbox'] {
-            margin: 8px 0 0 0;
-        }
+.admin__fieldset > .admin__field > .admin__field-control {
+    input.zip-is-range-checkbox {
+        margin: 8px 0 0 0;
     }
 }