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Center a position:fixed element

I would like to make a position: fixed; popup box centered to the screen with a dynamic width and height. I used margin: 5% auto; for this. Without position: fixed; it centers fine horizontally, but not vertically. After adding position: fixed; , it's even not centering horizontally. ...
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What is the difference between JOIN and JOIN FETCH when using JPA and Hibernate

... So, if you use the second query, you will not need to do a new query to hit the database again to see the Departments of each Employee. You can use the second query when you are sure that you will need the Department of each Employee. If you not need the Department, use the first query. I recome...
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Why is sizeof considered an operator?

... Because the C standard says so, and it gets the only vote. As consequences: The operand of sizeof can be a parenthesised type, sizeof (int), instead of an object expression. The parentheses are unnecessary: int a; printf("%d\n", sizeof a); is perfectly fine....
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Abusing the algebra of algebraic data types - why does this work?

...aic' expression for algebraic data types looks very suggestive to someone with a background in mathematics. Let me try to explain what I mean. ...
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C++ SFINAE examples?

...t into more template meta-programming. I know that SFINAE stands for "substitution failure is not an error." But can someone show me a good use for SFINAE? ...
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Why does dividing two int not yield the right value when assigned to double?

...le version, which returns a double, at least one of the ints must be explicitly casted to a double. c = a/(double)b; share | improve this answer | follow | ...
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Why am I not getting a java.util.ConcurrentModificationException in this example?

Note: I am aware of the Iterator#remove() method. 10 Answers 10 ...
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How can I write to the console in PHP?

Is it possible write a string or log into the console? 26 Answers 26 ...
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Sublime Text 2 - Show file navigation in sidebar

I just switched to Sublime Text as my new editor. If I open the sidebar it shows the opening file, but what I want is a file navigation sidebar, is it possible to change that without downloading plugins? ...
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How do I set environment variables from Java?

...her modify the current process's environment and let the subprocesses inherit it. 19 Answers ...