How to Capture ID in CSS Selector in Html

When I tried to build the table and tried to add colors, I encountered some problems.

In Wiz Wiz I defined it css selector , but the selector does id   not work well.

Why doesn’t the selector work?

And how to solve it? ID cannot start with a number. A good solution is to add a meaningful name before the number. And, as ellitt said, the id in html should be enclosed in quotation marks.

HTML:

<text id="alert1">Some text</text>
<text id="alert2">Some text</text>

CSS:

#alert1 {
    background-color: blue;
}
#alert2 {
    background-color: green;
}

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