diff --git a/doc/MANUAL.md b/doc/MANUAL.md
index 6b9852e..6bb6e49 100644
--- a/doc/MANUAL.md
+++ b/doc/MANUAL.md
@@ -32,6 +32,8 @@ This is the manual for version %%VERSION%%.
     - [Passwords](#users_passwords)
     - [Form limiting](#users_formlimit)
     - [Security considerations](#users_security)
+1. [Form customization](#cust)
+    - [Custom CSS](#cust_css)
 1. [Security](#security)
 
 ## <a name="invocations">Invocations</a>
@@ -119,6 +121,10 @@ Structurally, they are made up of the following elements:
   served. See also "[Serving static files](#output_static_files)".
   **Optional**, **String**.
 
+- **`custom_css`**: Path to a file containing custom CSS. It will be included
+  in every page's header. See also "[Form customization](#cust)". **Optional**,
+  **String**.
+
 - **`forms`**: A list of dictionaries of form definitions. **Required**, **List
     of dictionaries**.
 
@@ -154,9 +160,6 @@ Structurally, they are made up of the following elements:
       view it, if you know its name. This is useful for other forms to
       redirect to this forms and such.
 
-    - **`style`**: A string of inline CSS which will be applied to the field.
-      **Optional**, **String**.
-
     - **`fields`**: List of fields in the form. Each field is a dictionary.
       **Required**, **List of dictionaries**.
 
@@ -177,6 +180,9 @@ Structurally, they are made up of the following elements:
           pre-filled forms which takes it values from the GET request.
           **Optional**, **boolean**, **Default:** `false`.
 
+        - **`style`**: A string of inline CSS which will be applied to the field.
+          **Optional**, **String**.
+
         - **`...`**: Other options, which depend on the type of field.  For
           more information, see [Field types](#field_types). **Optional**.
 
@@ -525,6 +531,42 @@ For an example, see the [beginning of this chapter](#users).
   *does* support HTTPS, such as Apache. For more information on that, see
   the "Invocations" chapter.
 
+## <a name="cust">Form customization</a>
+
+### <a name="cust_css">Custom CSS</a>
+
+You can customize a form input field's style using the **`style`** property of
+the field definition in the form configuration. It takes a string that will be
+put in the generated form's `style=""` HTML attribute. For example:
+
+    "fields": [
+        {
+            "name": "background",
+            "title": "Different background color",
+            "type": "string",
+            "style": "background-color: #C0FFC0;"
+        }
+    ]
+
+The example above will render as:
+
+    <input required="" type="text" name="background" value="" size="" class="" style="background-color: #C0FFC0;">
+
+You can also include a global piece of CSS by specifying the **`custom_css`**
+property in the form definition. For example:
+
+    {
+        "title": "Customized forms",
+        "custom_css": "custom.css",
+        "forms": [
+        ...
+
+`custom.css` is the path to a file which will be included in the rendered HTML
+page in the `<style>` header. If the path is relative, it will be relative to
+the form configuration file's location.
+
+For a good example, see the `examples/customize/` directory in the source.
+
 ## <a name="security">Security</a>
 
 There are a few security issues to take into consideration when deploying Scriptform:
diff --git a/examples/customize/custom.css b/examples/customize/custom.css
new file mode 100644
index 0000000..9cfe1a2
--- /dev/null
+++ b/examples/customize/custom.css
@@ -0,0 +1,12 @@
+form {
+    background-color: #F0F0F0;
+    padding: 20px;
+    border-radius: 10px;
+}
+form li.submit input {
+    background-color: #FF0000;
+}
+div.result pre {
+    font-size: 12px;
+    overflow: scroll;
+}
diff --git a/examples/customize/customize.json b/examples/customize/customize.json
new file mode 100644
index 0000000..997914f
--- /dev/null
+++ b/examples/customize/customize.json
@@ -0,0 +1,20 @@
+{
+    "title": "Customized forms",
+    "custom_css": "custom.css",
+    "forms": [
+        {
+            "name": "custom",
+            "title": "Customized form",
+            "description": "This form is customized using global CSS and inline CSS.<br><br>The form's background has been made lightgray, the input box is green, the submit button is red and the results are wrapped in a scrolling viewport.",
+            "script": "job_customize.sh",
+            "fields": [
+                {
+                    "name": "background",
+                    "title": "Different background color",
+                    "type": "string",
+                    "style": "background-color: #C0FFC0;"
+                }
+            ]
+        }
+    ]
+}
diff --git a/examples/customize/job_customize.sh b/examples/customize/job_customize.sh
new file mode 100755
index 0000000..81c93fb
--- /dev/null
+++ b/examples/customize/job_customize.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+env
diff --git a/src/scriptform.py b/src/scriptform.py
index 52d46a0..171a429 100755
--- a/src/scriptform.py
+++ b/src/scriptform.py
@@ -28,7 +28,6 @@
 #    until the next request) to stop the server.
 # 10. The program exits.
 
-
 import sys
 import optparse
 import os
@@ -112,6 +111,9 @@ html_header = u'''<html>
     /* Other */
     div.about {{ text-align: center; font-size: 12px; color: #808080; }}
     div.about a {{ text-decoration: none; color: #000000; }}
+
+    /* Custom css */
+    {custom_css}
   </style>
 </head>
 <body>
@@ -139,11 +141,11 @@ html_form = u'''
 <div class="form">
   <h2 class="form-title">{title}</h2>
   <p class="form-description">{description}</p>
-  <form action="submit" method="post" enctype="multipart/form-data">
+  <form id="{name}" action="submit" method="post" enctype="multipart/form-data">
     <input type="hidden" name="form_name" value="{name}" />
     <ul>
         {fields}
-        <li>
+        <li class="submit">
           <input type="submit" class="btn btn-act" value="{submit_title}" />
           <a href="."><button type="button" class="btn btn-lnk" value="Back">Back to the list</button></a>
         </li>
@@ -222,13 +224,16 @@ class ScriptForm:
         config = json.load(file(self.config_file, 'r'))
 
         static_dir = None
-        forms = []
+        custom_css = None
         users = None
+        forms = []
 
-        if 'users' in config:
-            users = config['users']
         if 'static_dir' in config:
             static_dir = config['static_dir']
+        if 'custom_css' in config:
+            custom_css = file(config['custom_css'], 'r').read()
+        if 'users' in config:
+            users = config['users']
         for form in config['forms']:
             form_name = form['name']
             script = form['script']
@@ -248,7 +253,8 @@ class ScriptForm:
             config['title'],
             forms,
             users,
-            static_dir
+            static_dir,
+            custom_css
         )
         self.form_config_singleton = form_config
         return form_config
@@ -285,11 +291,12 @@ class FormConfig:
     file. It holds information (title, users, the form definitions) on the
     form configuration being served by this instance of ScriptForm.
     """
-    def __init__(self, title, forms, users={}, static_dir=None):
+    def __init__(self, title, forms, users={}, static_dir=None, custom_css=None):
         self.title = title
         self.users = users
         self.forms = forms
         self.static_dir = static_dir
+        self.custom_css = custom_css
         self.log = logging.getLogger('FORMCONFIG')
 
         # Validate scripts
@@ -811,7 +818,8 @@ class ScriptFormWebApp(WebAppHandler):
             )
 
         output = html_list.format(
-            header=html_header.format(title=form_config.title),
+            header=html_header.format(title=form_config.title,
+                                      custom_css=form_config.custom_css),
             footer=html_footer,
             form_list=u''.join(h_form_list)
         )
@@ -893,7 +901,8 @@ class ScriptFormWebApp(WebAppHandler):
             html_errors += u'</ul>'
 
         output = html_form.format(
-            header=html_header.format(title=form_config.title),
+            header=html_header.format(title=form_config.title,
+                                      custom_css=form_config.custom_css),
             footer=html_footer,
             title=form_def.title,
             description=form_def.description,
@@ -985,7 +994,8 @@ class ScriptFormWebApp(WebAppHandler):
                         msg = result['stdout'].decode('utf8')
 
                 output = html_submit_response.format(
-                    header=html_header.format(title=form_config.title),
+                    header=html_header.format(title=form_config.title,
+                                              custom_css=form_config.custom_css),
                     footer=html_footer,
                     title=form_def.title,
                     form_name=form_def.name,