how to change text color of a id inside class-CodePudding

I wrote a code and i created id inside class and when im trying to apply css properties on that I'd some of the properties are not working what is the problem.here is my css code

    #multiple{
        display:inline-block;
        background-color:black;
        border: 10px solid black;
        color:red;
        font-size:30;
        
    }

CodePudding user response：

You may not have linked the css file to your html file

CodePudding user response：

You can't create id inside class. If you create id then use id="idName" and define your css as #idName{ your css code }. And if you create class then use and define your css as .className{ your css code here }.