优化结算页面

app/code/JTool/CustomClass/Model/Plugin/AttributeMergerPlugin.php

+<?php
+
+/**
+ * Developer: Hemant Kumar Singh Magento Developer
+ * Website: http://www.wishusucess.com/
+ */
+
+namespace JTool\CustomClass\Model\Plugin;
+
+class AttributeMergerPlugin
+{
+    public function afterMerge(\Magento\Checkout\Block\Checkout\AttributeMerger $subject, $result)
+    {
+        if (array_key_exists('telephone', $result)) {
+            $result['telephone']['additionalClasses'] = 'teliphone_number';
+        }
+
+        return $result;
+    }
+}
\ No newline at end of file

app/code/JTool/CustomClass/etc/di.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../vendor/magento/framework/ObjectManager/etc/config.xsd">
+    <type name="\Magento\Checkout\Block\Checkout\AttributeMerger">
+        <plugin name="customAttributeMerger" type="\JTool\CustomClass\Model\Plugin\AttributeMergerPlugin"/>
+    </type>
+</config>
\ No newline at end of file

app/code/JTool/CustomClass/etc/module.xml

+<?xml version="1.0"?>
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
+    <module name="JTool_CustomClass" setup_version="1.0.0" active="true"></module>
+</config>
\ No newline at end of file

app/code/JTool/CustomClass/registration.php

+<?php
+\Magento\Framework\Component\ComponentRegistrar::register(
+    \Magento\Framework\Component\ComponentRegistrar::MODULE,
+    'JTool_CustomClass',
+    __DIR__
+);
\ No newline at end of file

app/design/frontend/Joshine/breeze/Magento_Checkout/templates/onepage.phtml

@@ -193,6 +193,7 @@
             padding: 20px;
         }
     }
+    .teliphone_number{width:100% !important;;}
     @media(min-width: 768px){
         .page-title-wrapper~.columns{
             margin-top:0;

app/design/frontend/Joshine/breeze/web/css/_custom.less

@@ -958,6 +958,9 @@ footer{
     opacity: 0;
     z-index: -1;
   }
+  .checkout-container{
+    width: 81%;
+  }
 }
 @media(max-width: 639.98px){
   .page-header .actions.wishlist-dropdown{