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Here's a working example that doesn't use tables: https://jsfiddle.net/q8zxxr3b/
Or, here's the inline example:
<div style="display: flex; height: 100%; flex-direction: column; align-items:center; justify-content: center;">
<div style="text-align: center;">
<h1>Hello world</h1>
The following green square should be centered:<br />
<div style="display: inline-block; width: 30px; height: 30px; background: green;"></div>
</div>
</div>For blocking tracking, the most effective tools are browser extensions made to block ads. Ghostery provides comparisons on an non-biased website between the methods of blocking tracking through browser modifications [1]. According to the site, the Do Not Track header actually has an effect with a difference of 18% in cookie size when the header is set. AdBlock Edge and disabling third-party cookies results in a 59% and 40% decrease in cookie size respectively. It seems that the easiest thing you can do to lessen your internet footprint would be to disable third-party cookies and enable the DNT header, and the majority of tracking can be eliminated through the use of a browser extension. (But with the recent revelations [2], using a browser extension may actually reduce your browsing experience if you don't have the RAM to spare.)
[1] http://www.areweprivateyet.com/ [2] https://news.ycombinator.com/item?id=8802424
[1] https://github.com/oniony/TMSU/blob/master/src/tmsu/common/f...