Question

<div id ="group">
    <img src= ' ' id = '1'>
    <img src= ' ' id = '2'>
    .......
</div>

I would like to reference all the img in the div id ‘group’ , how to mark it in css? Also, Which is better? Assign all to img / create a class eg. #img.groupItem and reference it everytime? Thanks

The source code:

<div id="book">
    <img alt="flip book" src="demo/medium/Web081112_P001_medium.jpg">
    <img alt="flip book" src="demo/medium/Web081112_P002_medium.jpg">
    <img alt="flip book" src="demo/medium/Web081112_P003_medium.jpg">
</div>

After running the javascript:

<div id="page" style="display: block; width: 1180px; height: 767px; left: 50%; top: 50%; margin: -413.5px auto 0px -590px; cursor: default;">
    <div id="book" style="position: relative; width: 1180px; height: 767px; transform: translate3d(0px, 0px, 0px);">
        <div class="turn-page-wrapper" page="1" style="position: absolute; overflow: hidden; width: 590px; height: 767px; top: 0px; right: 0px; left: auto; bottom: auto; z-index: 0; display: none;">
            <div id="cover" class="turn-page p1" style="width: 590px; height: 767px;">
            </div>
        </div>
        <div class="turn-page-wrapper" page="2" style="position: absolute; overflow: hidden; width: 590px; height: 767px; top: 0px; left: 0px; right: auto; bottom: auto; z-index: 7;">
            <div style="position: absolute; top: 0px; left: 0px; overflow: hidden; z-index: auto; width: 968px; height: 968px;">
                <div class="turn-page p2" style="width: 590px; height: 767px; position: absolute; top: 0px; left: 0px; bottom: auto; right: auto;">
                    <img alt="flip book" src="demo/medium/Web081112_P001_medium.jpg">
                </div>
            </div>
        </div>
    </div>
</div>

The html code is like that for a single img , I used the answer provided here but still not work. I believe this is the problem caused by generate html code?

Answer 1

CSS was meant to apply global styling with the help of selectors.

The descendant selector is what you are looking for:

#group img {
    // code
}