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Flexbox: center horizontally and vertically

How to center div horizontally, and vertically within the container using flexbox. In below example, I want each number below each other (in rows), which are centered horizontally. ...
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Difference between CC, gcc and g++?

...t are the difference between the 3 compilers CC, gcc, g++ when compiling C and C++ code in terms of assembly code generation, available libraries, language features, etc.? ...
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How to count certain elements in array?

... to use the right tool for the job" -requests never made much sense to me. And we can argue what is most elegant. E.g. for me, making a function call per element to just to compare it to a value is not elegant. – Felix Kling May 25 '11 at 8:33 ...
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Redirect non-www to www in .htaccess

... ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L] If you need to support http and https and preserve the protocol choice try the following: RewriteRule ^login\$ https://www.%{HTTP_HOST}/login [R=301,L] Where you replace login with checkout.php or whatever URL you need to support HTTPS on. I'd argue...
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Why isn't sizeof for a struct equal to the sum of sizeof of each member?

...y alignment constraints. Data structure alignment impacts both performance and correctness of programs: Mis-aligned access might be a hard error (often SIGBUS). Mis-aligned access might be a soft error. Either corrected in hardware, for a modest performance-degradation. Or corrected by emulation...
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What is a mixin, and why are they useful?

...ming Python ", Mark Lutz mentions "mixins". I'm from a C/C++/C# background and I have not heard the term before. What is a mixin? ...
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The new keyword “auto”; When should it be used to declare a variable type? [duplicate]

Have we (as a community) had enough experience to determine when and/or whether auto is being abused? 6 Answers ...
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javascript toISOString() ignores timezone offset [duplicate]

...The slice(0, -1) gets rid of the trailing Z which represents Zulu timezone and can be replaced by your own. share | improve this answer | follow | ...
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Manual deployment vs. Amazon Elastic Beanstalk

...tages we get by using Elastic Beanstalk over maually creating EC2 instance and setting up tomcat server and deploy etc for a typical java web applicaion. Are load balancing, Monitoring and autoscaling the only advantages? ...
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Is there any way to git checkout previous branch?

... sort of want the equivalent of cd - for git. If I am in branch master and I checkout foo , I would love to be able to type something like git checkout - to go back to master , and be able to type it again to return to foo . ...