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Responsive css background images

I have a website (g-floors.eu) and I want to make the background (in css I have defined a bg-image for the content) also responsive. Unfortunately I really don't have any idea on how to do this except for one thing that I can think of but it's quite a workaround. Creating multiple images and then us...
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What does the “-U” option stand for in pip install -U

Despite a ton of Googling, I can't find any docs for pip's command line options/arguments. What does pip install -U mean? Does anyone have a link to a list of pip's options and arguments? ...
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matplotlib colorbar for scatter

...appable object, like the CircleCollection that plt.scatter() returns. vmin and vmax can then control the limits of your colorbar. Things outside vmin/vmax get the colors of the endpoints. How does this work for you? import matplotlib.pyplot as plt cm = plt.cm.get_cmap('RdYlBu') xy = range(20) z =...
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Force Git to always choose the newer version during a merge?

Let's assume I merge git and there is a merge conflict. 2 Answers 2 ...
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How do I create delegates in Objective-C?

I know how delegates work, and I know how I can use them. 19 Answers 19 ...
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TypeScript: Creating an empty typed container array

... In the vast majority of cases the mentioned downsides would be negligible and readability is the most important factor. *: Fun fact; at the time of writing the performance difference was 60% in Chrome, while in Firefox there was no measurable performance difference. ...
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Where is the itoa function in Linux?

itoa() is a really handy function to convert a number to a string. Linux does not seem to have itoa() , is there an equivalent function or do I have to use sprintf(str, "%d", num) ? ...
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.gitignore exclude files in directory but not certain directories

... following contents: * !.gitignore Then, you can add those directories, and only the .gitignore file in each directory will get added -- but this means the directories will now be tracked (i.e., created when cloning). sha...
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Get the first element of each tuple in a list in Python [duplicate]

... @Creak - x,_ is just using tuple unpacking. And you are right, the documentation on this is hard to come by. I found this link and this one which should explain how it works. Also, the _ is just a normal variable. I could have done x,y and got the same results. How...
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Is PHP's count() function O(1) or O(n) for arrays?

...unt the all the elements of a PHP array, or is this value cached somewhere and just gets retrieved? 3 Answers ...