headerFix.css

/* 2 */
#header-left {
	display: none !important;
}

#header-right {
	float:  unset !important;
}

#header-right .widget.widget_nav_menu {
	float:  unset !important;
	text-align: center !important;
}

membersID.php

/*
1. Some guy wants all of his members to have a unique customer ID that he can display whilst they’re logged in. He wants to simply activate the plugin, which has the option of a shortcode to use in his posts/pages, and a function to use within his theme, can you make a simple plugin or some code that they can use within their theme functions.php?
Over to you!
*/

<?php
	function nexy_customer_id() {
		if(is_user_logged_in()) {
			$userID = get_current_user_id();
			return "Customer unique ID: " . $userID;
		}else {
			return;
		}
	}
	add_shortcode('getCustomerID', 'nexy_customer_id');

UpdateLayout.css

/* 4 */
#top-navigation-bar {
  background: #6391f3;
  border-top: 1px solid #6391f3;
  border-bottom: 1px solid #6391f3;
  margin-top: 10px;
}

.sf-menu li {
  background-color: #6391f3;
}

#topbar ul li a {
  color: yellow;
}

#topbar ul li a {
  text-shadow: #6391f3 -1px 1px 0px;
}

#topbar ul li.current, #topbar ul li.current_page_item {
  background: #6391f3;
}

body {
  background: #000;
}

a.comment-reply-link, a.button, input[type="submit"], input[type="button"], ul.button-nav li a, div.generic-button a, ul.button-nav li a {
  background: #6592ef;
}

.articles li {
  padding: 10px 48px;
  border-radius: 5px;
  text-align: center;
}

.articles li h3 a {
  color: #6592ef;
}

.generic-box {
  border-radius: 5px;
}

#content {
  padding: 0px;
}