first import

sites/all/modules/panels/plugins/layouts/onecol/onecol.css

@@ -0,0 +1,22 @@
+
+.panel-1col {
+/*  overflow: hidden;  */
+}
+
+.panel-2col .panel-col-first .inside {
+  margin: 0;
+}
+
+
+.panel-1col .panel-col {
+  width: 100%;
+}
+
+#panels-edit-display .panel-pane,
+#panels-edit-display .helperclass {
+  margin: .5em;
+}
+
+.panel-2col .panel-separator {
+  margin: 0 0 1em 0;
+}

sites/all/modules/panels/plugins/layouts/onecol/onecol.inc

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+<?php
+
+/**
+ * implementation of hook_panels_layouts()
+ */
+// Plugin definition
+$plugin = array(
+  'title' => t('Single column'),
+  'category' => t('Columns: 1'),
+  'icon' => 'onecol.png',
+  'theme' => 'panels_onecol',
+  'css' => 'onecol.css',
+  'regions' => array('middle' => t('Middle column')),
+);

sites/all/modules/panels/plugins/layouts/onecol/panels-onecol.tpl.php

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+<?php
+/**
+ * @file
+ * Template for a 3 column panel layout.
+ *
+ * This template provides a very simple "one column" panel display layout.
+ *
+ * Variables:
+ * - $id: An optional CSS id to use for the layout.
+ * - $content: An array of content, each item in the array is keyed to one
+ *   panel of the layout. This layout supports the following sections:
+ *   $content['middle']: The only panel in the layout.
+ */
+?>
+<div class="panel-display panel-1col clearfix" <?php if (!empty($css_id)) { print "id=\"$css_id\""; } ?>>
+  <div class="panel-panel panel-col">
+    <div><?php print $content['middle']; ?></div>
+  </div>
+</div>