diff --git a/src/_posts/2019-08-30-civicrm-mailing-validation.md b/src/_posts/2019-08-30-civicrm-mailing-validation.md
index 9651b02..7b4e40f 100644
--- a/src/_posts/2019-08-30-civicrm-mailing-validation.md
+++ b/src/_posts/2019-08-30-civicrm-mailing-validation.md
@@ -29,7 +29,9 @@ duplicate mailing names for our client… and now for you, too!
 
 Using [`civix`](https://github.com/totten/civix), we set up a new CiviCRM extension for our code:
 
-    civix generate:module mailing
+```sh
+$ civix generate:module mailing
+```
 
 (We called our extension `mailing`, because our creative director was occupied
 with an Art at the time)
@@ -45,20 +47,21 @@ an AngularJS page loads, and you can use a `ChangeSet` to edit an AngularJS
 template. Because AngularJS templates specify form logic, this also lets you
 change the validation behaviour. Our hook function looks like this:
 
-    function mailing_civicrm_alterAngular($angular) {
-      $changeSet = \Civi\Angular\ChangeSet::create('mailing_name_unique')
-        ->alterHtml('~/crmMailing/BlockSummary.html', function(phpQueryObject $doc) {
-          // name validation
-          $doc->find('.crm-group:has([crm-ui-id="subform.mailingName"])')->attr('ng-controller', 'NameValidateCtrl');
-          $doc->find('[crm-ui-id="subform.mailingName"]')->attr('ng-blur', 'validateName(mailing, \'name\')');
-          $doc->find('[crm-ui-id="subform.mailingName"]')->attr('crm-ui-validate', 'isValid');
-        });
+```php
+function mailing_civicrm_alterAngular($angular) {
+  $changeSet = \Civi\Angular\ChangeSet::create('mailing_name_unique')
+    ->alterHtml('~/crmMailing/BlockSummary.html', function(phpQueryObject $doc) {
+      // name validation
+      $doc->find('.crm-group:has([crm-ui-id="subform.mailingName"])')->attr('ng-controller', 'NameValidateCtrl');
+      $doc->find('[crm-ui-id="subform.mailingName"]')->attr('ng-blur', 'validateName(mailing, \'name\')');
+      $doc->find('[crm-ui-id="subform.mailingName"]')->attr('crm-ui-validate', 'isValid');
+    });
 
-      $angular->add($changeSet);
-
-      CRM_Core_Resources::singleton()->addScriptFile('mailing', 'js/disallow-duplicate-names.js');
-    }
+  $angular->add($changeSet);
 
+  CRM_Core_Resources::singleton()->addScriptFile('mailing', 'js/disallow-duplicate-names.js');
+}
+```
 
 Setting `crm-ui-validate` to `validateName` directly fired the event _way_ too
 many times, so instead `validateName` is only called when focus leaves the
@@ -70,40 +73,42 @@ field, `ng-blur`, which then sets the `isValid` variable that's checked by
 Then, the code which queries the CiviCRM API to check for mailings with
 duplicate names:
 
-    var validating = false;
-    
-    (function(angular, $) {
-      var crmMailing = angular.module('crmMailing');
-    
-      crmMailing.controller('NameValidateCtrl', function($scope) {
-          $scope.isValid = false;
-    
-          $scope.validateName = function(mailing, field) {
-            if (!validating) {
-              validating = true;
-    
-              CRM.api3('Mailing', 'get', {
-                "sequential": 1,
-                "name": mailing[field],
-                "id": {"!=": mailing.id}
-              }).then(function(result) {
-                // do something with result
-                if (result.count > 0 ) {
-                  $scope.isValid = false;
-                  CRM.alert(ts('There is already a mailing with this name; sending this one will crash CiviCRM!'));
-                } else {
-                  $scope.isValid = true;
-                }
-              }, function(error) {
-                // oops
-                console.log(error);
-              });
-    
-              validating = false;
-          }
-        };
-      });
-    })(angular, CRM.$);
+```javascript
+var validating = false;
+
+(function(angular, $) {
+  var crmMailing = angular.module('crmMailing');
+
+  crmMailing.controller('NameValidateCtrl', function($scope) {
+      $scope.isValid = false;
+
+      $scope.validateName = function(mailing, field) {
+        if (!validating) {
+          validating = true;
+
+          CRM.api3('Mailing', 'get', {
+            "sequential": 1,
+            "name": mailing[field],
+            "id": {"!=": mailing.id}
+          }).then(function(result) {
+            // do something with result
+            if (result.count > 0 ) {
+              $scope.isValid = false;
+              CRM.alert(ts('There is already a mailing with this name; sending this one will crash CiviCRM!'));
+            } else {
+              $scope.isValid = true;
+            }
+          }, function(error) {
+            // oops
+            console.log(error);
+          });
+
+          validating = false;
+      }
+    };
+  });
+})(angular, CRM.$);
+```
 
 (saved as `js/disallow-duplicate-names.js`)
 
@@ -111,7 +116,9 @@ duplicate names:
 
 Activate the extension, e.g. with `cv`
 
-     $ cv en mailing
+```
+$ cv en mailing
+```
 
 Now, open a mailing and try to give it the same name as an existing one – you
 should see the field border turn red, and you'll be prevented from continuing or
diff --git a/src/assets/styles/components/_highlighting.scss b/src/assets/styles/components/_highlighting.scss
new file mode 100644
index 0000000..488dd95
--- /dev/null
+++ b/src/assets/styles/components/_highlighting.scss
@@ -0,0 +1,73 @@
+pre.highlight {
+    color: #93A1A1;
+    background-color: #002B36;
+
+    .c { color: #586E75 } /* Comment */
+    .err { color: #93A1A1 } /* Error */
+    .g { color: #93A1A1 } /* Generic */
+    .k { color: #859900 } /* Keyword */
+    .l { color: #93A1A1 } /* Literal */
+    .n { color: #93A1A1 } /* Name */
+    .o { color: #859900 } /* Operator */
+    .x { color: #CB4B16 } /* Other */
+    .p { color: #93A1A1 } /* Punctuation */
+    .cm { color: #586E75 } /* Comment.Multiline */
+    .cp { color: #859900 } /* Comment.Preproc */
+    .c1 { color: #586E75 } /* Comment.Single */
+    .cs { color: #859900 } /* Comment.Special */
+    .gd { color: #2AA198 } /* Generic.Deleted */
+    .ge { color: #93A1A1; font-style: italic } /* Generic.Emph */
+    .gr { color: #DC322F } /* Generic.Error */
+    .gh { color: #CB4B16 } /* Generic.Heading */
+    .gi { color: #859900 } /* Generic.Inserted */
+    .go { color: #93A1A1 } /* Generic.Output */
+    .gp { color: #93A1A1 } /* Generic.Prompt */
+    .gs { color: #93A1A1; font-weight: bold } /* Generic.Strong */
+    .gu { color: #CB4B16 } /* Generic.Subheading */
+    .gt { color: #93A1A1 } /* Generic.Traceback */
+    .kc { color: #CB4B16 } /* Keyword.Constant */
+    .kd { color: #268BD2 } /* Keyword.Declaration */
+    .kn { color: #859900 } /* Keyword.Namespace */
+    .kp { color: #859900 } /* Keyword.Pseudo */
+    .kr { color: #268BD2 } /* Keyword.Reserved */
+    .kt { color: #DC322F } /* Keyword.Type */
+    .ld { color: #93A1A1 } /* Literal.Date */
+    .m { color: #2AA198 } /* Literal.Number */
+    .s { color: #2AA198 } /* Literal.String */
+    .na { color: #93A1A1 } /* Name.Attribute */
+    .nb { color: #B58900 } /* Name.Builtin */
+    .nc { color: #268BD2 } /* Name.Class */
+    .no { color: #CB4B16 } /* Name.Constant */
+    .nd { color: #268BD2 } /* Name.Decorator */
+    .ni { color: #CB4B16 } /* Name.Entity */
+    .ne { color: #CB4B16 } /* Name.Exception */
+    .nf { color: #268BD2 } /* Name.Function */
+    .nl { color: #93A1A1 } /* Name.Label */
+    .nn { color: #93A1A1 } /* Name.Namespace */
+    .nx { color: #93A1A1 } /* Name.Other */
+    .py { color: #93A1A1 } /* Name.Property */
+    .nt { color: #268BD2 } /* Name.Tag */
+    .nv { color: #268BD2 } /* Name.Variable */
+    .ow { color: #859900 } /* Operator.Word */
+    .w { color: #93A1A1 } /* Text.Whitespace */
+    .mf { color: #2AA198 } /* Literal.Number.Float */
+    .mh { color: #2AA198 } /* Literal.Number.Hex */
+    .mi { color: #2AA198 } /* Literal.Number.Integer */
+    .mo { color: #2AA198 } /* Literal.Number.Oct */
+    .sb { color: #586E75 } /* Literal.String.Backtick */
+    .sc { color: #2AA198 } /* Literal.String.Char */
+    .sd { color: #93A1A1 } /* Literal.String.Doc */
+    .s2 { color: #2AA198 } /* Literal.String.Double */
+    .se { color: #CB4B16 } /* Literal.String.Escape */
+    .sh { color: #93A1A1 } /* Literal.String.Heredoc */
+    .si { color: #2AA198 } /* Literal.String.Interpol */
+    .sx { color: #2AA198 } /* Literal.String.Other */
+    .sr { color: #DC322F } /* Literal.String.Regex */
+    .s1 { color: #2AA198 } /* Literal.String.Single */
+    .ss { color: #2AA198 } /* Literal.String.Symbol */
+    .bp { color: #268BD2 } /* Name.Builtin.Pseudo */
+    .vc { color: #268BD2 } /* Name.Variable.Class */
+    .vg { color: #268BD2 } /* Name.Variable.Global */
+    .vi { color: #268BD2 } /* Name.Variable.Instance */
+    .il { color: #2AA198 } /* Literal.Number.Integer.Long */
+}
diff --git a/src/assets/styles/main.scss b/src/assets/styles/main.scss
index c4373ca..338bffa 100644
--- a/src/assets/styles/main.scss
+++ b/src/assets/styles/main.scss
@@ -43,6 +43,7 @@
 @import 'components/header';
 @import 'components/banner';
 @import 'components/contact';
+@import 'components/highlighting';
 
 /* Main */