Error: 403 When Modifying Email Header Template

See attachment.

I'm simply trying to add a new css rule in header snippet template.

Error:

Access is forbidden to the requested page

cottageworks.co.nz/marketplace/admin.php (port 443)

I'm pretty sure permission are set up properly.

What else could it be?

UPDATE:

I can edit any other template. The issue seems to be with the header snipper template only.

If I delete everything in the template and enter a single character, the template saves without problem.

Can someone take a look at the template and see if anything is wrong?

The following is the entire template:



  
  
  {{ company_name }}: Message title
  
    #outlook a {
      padding: 0;
    }
body {
  width: 100% !important;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  margin: 0;
  padding: 0;
}

img {
  outline: none;
  text-decoration: none;
  -ms-interpolation-mode: bicubic;
}

a {
  outline: none;
}

a img {
  border: none;
}

.image_fix {
  display: block;
}

.message-header > td {
  padding: 10px 30px 20px 30px;
}

.message-header__title {
  background-color: {% if styles.links %}{{styles.links}}{% else %}#999{% endif %}
}

.message-header__title > td {
  padding: 20px 30px;
}

.message-header__title h1 {
  font-size: 20px;
  text-transform: uppercase;
  font-weight: 400;
  color: #Fff;
}

.message-title > td,
.message-body > td {
  padding: 30px;
}

.message-footer > td {
  padding: 20px 30px;
  background-color: #757f83;
}

.message-copyright > td {
  padding: 0px 30px 10px;
}

.message-header td,
.message-title td,
.message-body th, .message-body td,
.message-footer th, .message-footer td,
.message-copyright th, .message-copyright td {
  color: {{styles.font}};
  font-size: {{styles.body_font_size}};
  font-family: {{styles.body_font}},Helvetica,Arial,sans-serif;
}

.message-footer {
  border-top: 1px solid {{styles.base}}
}

.message-body table th,
.message-footer table th {
  text-transform: uppercase;
  border-bottom: 1px solid {{styles.base}};
  text-align: left;
}

.message-body table td,
.message-footer table td {
  padding: 5px;
}

.message-footer table th{
   border: none;
}

.message-footer td {
  color: #fff;
}

.footer-contact__title {
  margin: 0px;
  text-transform: uppercase;
  font-size: 16px !important;
  font-weight: 600;
  color: #fff !important;
}

.footer-social__title {
  margin: 0px;
  text-transform: uppercase;
  font-size: 16px !important;
  font-weight: 600;
  color: #fff !important;
}

.message-footer table td.footer-social td {
  padding: 0px;
  padding-right: 10px;
}

.email-preview{
  display:none;
  font-size:1px;
  color:#333333;
  line-height:1px;
  max-height:0px;
  max-width:0px;
  opacity:0;
  overflow:hidden;
}

.with-subline {
  color: {{styles.font}};
  text-transform: uppercase;
  font-weight: 700;
  font-size: 1em;
  padding-bottom: 10px;
  border-bottom: 1px solid #D4D4D4;
}

p {
  margin: 1em 0;
}

h1,h2,h3,h4,h5,h6 {
  color: {{styles.font}};
}

h1 a,h2 a,h3 a,h4 a,h5 a,h6 a {
  color: {{styles.links}};
}

h1 a:active,h2 a:active,h3 a:active,h4 a:active,h5 a:active,h6 a:active {
  color: red;
}

h1 a:visited,h2 a:visited,h3 a:visited,h4 a:visited,h5 a:visited,h6 a:visited {
  color: purple;
}

table td,
table th {
  border-collapse: collapse;
}

table {
  border-collapse: collapse;
  mso-table-lspace: 0pt;
  mso-table-rspace: 0pt;
}

address {
  margin: 0px;
}

.content-wrapper {
  border: 1px solid {{ styles.base    }}
}

.copyright td {
  padding: 10px 0 0 0;
  padding-bottom: 0 !important;
}

a {
  color: {{styles.links}};
}
@media only screen and (max-device-width: 480px){ .content-wrapper{width: 100% !important;border: 3px solid #ccc !important; }
    table[width]{
      width: 100%! important;
    }

    .message-header > td,
    .message-title > td,
    .message-body > td,
    .message-footer > td,
    .message-copyright > td {
      padding: 10px !important;
    }

    .message-header td,
    .message-title td,
    .message-body th, .message-body td,
    .message-footer th, .message-footer td,
    .message-copyright th, .message-copyright td {
      font-size: 16px !important;
    }
 }

  @media only screen and (min-device-width: 768px) and (max-device-width: 1024px) {}

  @media only screen and (-webkit-min-device-pixel-ratio: 2) {}

  @media only screen and (-webkit-device-pixel-ratio:.75) {}

  @media only screen and (-webkit-device-pixel-ratio:1) {}

  @media only screen and (-webkit-device-pixel-ratio:1.5) {}

{% if title %} {% endif %}
      
{{ company_data.company_name }}

{{title}}

header-error.PNG