#11 CSS3 Flexbox: RWD

How do RWD control columns displaying on devices of different pixels ?

First of all, if we want the flexbox to automatically move to the next line when the pixels decrease, try "flex-wrap:wrap" after "the display:flex."

main{
    display:flex;flex-wrap:wrap;
    justify-content:center; 
    background-color:#cccccc;
}

For adapting to different devices’ pixels:

1. 1200 px: 4 columns, fixed pixel
→ PC, which is the same as last practice.

2. 500 px ~ 1200 px: 2 columns, flexible pixel
→ iPad

In this case, we adopt media query to change the width of items by

@media (max-width:1200px) {
    main>.item{
    width:45%;
    }   
}

3. < 500 px: 1 column, flexible pixel
→ mobile device

Follow the media query above, but adjust the percentage to 90%.

@media (max-width:500px) {
    main>.item{
    width:90%;
    }   
}

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