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    <blockquote> <p>Question 1.) Why does vertical centering not work if I remove the height: 100% css property?</p> </blockquote> <p>By default, the <code>html</code> and <code>body</code> elements expand height to fit their content. So, without setting the height, your <code>html</code> is only as tall as it needs to be to contain the content as styled. In addition absolutely positioned elements do not affect the size of their parents. Without setting the height to 100%, <code>area</code> will not be the full height of your window either, so you will be vertically centering in a small strip at the top of your page.</p> <blockquote> <p>Question 2.) When height: 100% is declared on the html tag, why is the site bigger than 100% and extends beyond the browser window?</p> </blockquote> <p>That alone will not extend beyond the page boundaries. However, if you add margins, borders, or similar attributes to 100% elements, these are added <em>in addition</em> to the 100%, making your elements extend past the edge of the window.</p> <blockquote> <p>Question 3.) Why is bottom-left displayed correctly, but not bottom-right?</p> </blockquote> <p>You are absolutely positioning these elements. Div elements are generally 100% the width of the parent element. However, when you absolutely position them, their width shrinks to fit the content. In your case, you are trying to <code>text-align</code> within a <code>div</code> that is left-aligned by default. Because the <code>div</code> is only as big as the text, left, right, and center alignment all look the same. Because you are already absolutely positioning the <code>div</code>s, just use absolute positioning to align them:</p> <pre><code>.bottom-left { position: absolute; bottom: 15px; left: 15px; } .bottom-right { position: absolute; bottom: 15px; right: 15px; } </code></pre>
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    1. POCentering Div Element vertically
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    1. COthanks jeff! About Question 1: I put margin-top/bottom: zero in the html tag which made the site not extend beyond the browser window again. I only defined margin-left:15% before though and wonder why this adds a marging to the bottom or top? or does the html always have small margin by default?
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      1. USRoland
    2. COYou have `margin-left: 20px;` in your body. You probably shouldn't do this. Instead, either do a padding, or just absolutely position your elements over 20px. For instance, do `left: 20px` on your title.
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    3. COAnd @Roland, each browser has a number of different default CSS definitions. Usually the body has padding by default, along with a number of other styles that vary from browser to browser. It is usually a good idea to "normalize" your CSS with a CSS reset stylesheet. Here is one example: http://meyerweb.com/eric/tools/css/reset/
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