*
{
  /* 
    Defines the main font used throughout the entire site.
  */
  font-family: Arial, Sans-Serif;
}

body
{
  /* 
    Clears white space around the body and gives it a grey background color.
  */
  margin: 0;
  background-color: #cccccc;
}

a
{
  /*
    Clears the underline on normal links, and gives them a different text color.
  */
  text-decoration: none;
  color: #0760B2;
}

  a:hover
  {
    /*
    Underlines links when the user hovers the mouse over them.
  */
    text-decoration: underline;
  }

h1
{
  /*
    Makes h1 elements smaller than their browser default.
  */
  font-size: 20px;
}

h2
{
  /* 
    Gives h2 elements a different background color and size, 
    and adds a bit of margin at the top to create room between the heading and the preceding element.
  */
  font-size: 14px;
  color: #7773A1;
  margin-top: 10px;
}

#PageWrapper
{
  /*
    Sets the total width for the entire page. Also sets the background color
    which is used to fill the background of the Sidebar in case the MainContent section is taller than the Sidebar.
    Uses margin: auto to center the entire page in the middle of the browser's window.
  */
  width: 844px;
  margin: auto;
}

header
{
  /*
    Gives the header the same width as the PageWrapper. The height creates some room for the logo
    that is set with the background-image.
  */
  background-image: url(Images/MyLabPattern.jpg);
  background-repeat: repeat;
  background-color: #A8D5FE;
  margin-top: 2px;
  width: 844px;
  height: 150px;
}

  header a
  {
    /*
    The header a is a link nested in header. It provides a link back to the homepage.
    The size of the link is the same as the header, so the entire header is clickable.
  */
    width: 844px;
    height: 149px;
    display: block;
  }

nav
{
  /*
    The menu spans the page width, right below the header.
    At the top and left a few pixels padding is applied to create some room.
  */
  background-image: url(Images/MenuBackground.jpg);
  background-repeat: no-repeat;
  width: 827px;
  height: 36px;
  padding-top: 7px;
  padding-left: 17px;
}

  nav a
  {
    /*
    Links in the Menu are white. This gets overriden by styles in chapter 7.
  */
    color: #fff;
  }

.MainMenu
{
  /*
    The Menu gets a white border on all four sides.
  */
  border: 1px solid #999999;
  width: 814px;
  height: 19px;
  background-color: #0760B2
}

  .MainMenu ul li
  {
    /*
    Gives the four menu items in the main menu a width of 200px each.
  */
    width: 135px;
  }

section#MainContent
{
  /*
    Defines the main content area. The #MainContent element has a minimum height of 500 pixels, but can grow if necessary.
    The font-size is 80% of its parent element, which in this case comes down to 80% of the font
    the user has specified as the default font in the browser.
  */
  font-size: 1.2em;
  width: 670px;
  border-left: 1px solid white;
  border-right: 2px solid white;
  float: left;
  background-image: url(Images/MyLabPattern.jpg);
  background-repeat: repeat;
  /*background-color: #e1e1e1;*/
  min-height: 980px;
  padding: 10px;
}

aside#Sidebar
{
  /*
    The Sidebar is positioned to the right of the MainContent section. It gets the same font-size as the 
	#MainContent section and gets a background image called Sidebar.jpg. 
	To ensure the image is visible in (most) browsers on a small page, the element gets a minimum 
	height of 500px. This is ignored by IE 6.
  */
  font-size: 0.8em;
  color: White;
  background-image: url(Images/LabLogoVertical2.jpg);
  background-repeat: no-repeat;
  /*background-color: #7773A1;*/
  width: 150px;
  min-height: 980px;
  padding-top: 10px;
  padding-bottom: 10px;
  /*padding-left: 20px;*/
  float: left;
}

footer
{
  /*
    The footer is positioned below all other content (yet still within PageWrapper).
    clear: both is used to clear the impact of the float properties used for #MainContent and #Sidebar.
  */
  width: 844px;
  clear: both;
  height: 37px;
  background-color: #A8D5FE;
  color: White;
  text-align: center;
  font-size: 0.7em;
  font-weight: bold;
  line-height: 37px;
}

/*.Introduction
{
  font-style: italic;
  color: #3e3e3e;
}*/
ul.level1
{
/* Defines the appearance of main menu items. */
font-size: 14px;
font-weight: bold;
height: 19px;
line-height: 19px;
}
ul.level1 .selected
{
/* Defines the appearance of active menu items. */
background-color: #509EE7;
}
a.level1
{
/* Adds some white space to the left of the main menu item text.
!important is used to overrule the in-line CSS that the menu generates */
padding-left: 5px !important;
}
a.level2
{
/* Defines the appearance of the sub menu items. */
background-color: #555555;
padding-left: 8px;
}
a.level1:hover, a.level2:hover
{
/* Defines the hover style for the main and sub items. */
background-color: #509EE7;
}