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Responsive image align center bootstrap 3

I do a catalog using Bootstrap 3. When displayed on tablets, the product images look ugly because of their small size (500x500) and a width of 767 pixels in the browser. I want to put the image in the center of the screen, but for some reason I can not. Who be will help solve the problem? ...
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How to install a specific version of a ruby gem?

... answered Jun 10 '13 at 14:37 mjsmjs 54.3k2424 gold badges7979 silver badges111111 bronze badges ...
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Selecting a row of pandas series/dataframe by integer index

... am curious as to why df[2] is not supported, while df.ix[2] and df[2:3] both work. 6 Answers ...
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Adding gif image in an ImageView in android

...tected int dispose = 0; // 0=no action; 1=leave in place; 2=restore to bg; 3=restore to prev protected int lastDispose = 0; protected boolean transparency = false; // use transparent color protected int delay = 0; // delay in milliseconds protected int transIndex; // transparent colo...
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Algorithm to find Largest prime factor of a number

... 134 Actually there are several more efficient ways to find factors of big numbers (for smaller ones...
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adding noise to a signal in python

... AkavallAkavall 62.1k3838 gold badges170170 silver badges215215 bronze badges ...
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For each row return the column name of the largest value

...amples using sample reproducible): DF <- data.frame(V1=c(2,8,1),V2=c(7,3,5),V3=c(9,6,4)) colnames(DF)[apply(DF,1,which.max)] [1] "V3" "V1" "V2" A faster solution than using apply might be max.col: colnames(DF)[max.col(DF,ties.method="first")] #[1] "V3" "V1" "V2" ...where ties.method can be...
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find vs find_by vs where

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Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...1点的,你可以洗洗去睡了。很多公司都有做到第2点和第3点,这些公司的服务端程序基本已经跑了很长时间了,已比较稳定,确实无需花太多时间去关注。如果一个新产品,在上线初期,我觉得就有必要做到第4点。 日志怎么看...
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Fastest way to iterate over all the chars in a String

... 354 FIRST UPDATE: Before you try this ever in a production environment (not advised), read this fi...