OMITemplateModder/Template/config/edit.php

<div class="page-header">
  <h2><?= $title ?></h2>
  <h3><?= $subtitle ?></h3>
</div>

<form method="post" action="<?= $this->url->href('TemplateController', 'save', ['plugin' => 'OMITemplateModder', 'template_index' => $template_index]) ?>">
  <?= $this->form->csrf() ?>
  
  <div class="form-group">
    <label for="form-content">Template Content</label>
    <textarea name="content" id="form-content" class="form-textarea" rows="20" style="width:100%;font-family:monospace;"><?= $template_content ?></textarea>
  </div>
  
  <div class="form-actions">
    <button type="submit" class="btn btn-blue">Save</button>
    <?= $this->url->link(t("Cancel"), "TemplateController", "show", ["plugin" => "OMITemplateModder"], false, "btn") ?>
  
  </div>
</form>