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Q: How to use .class in css class in Vuejs? Please, I am facing some problem in the following code: HTML: Script: CSS: But, the page is loading without changing the background color of #about section. I have tried many other things but in vain. So please someone help me out. Thanks. A: The thing is your code isn't using your class at all. Your code is setting background-color of class color which is not defined anywhere in your project. It might be some plugin/dependency that is creating this class but you won't know because of your lack of information. Here is your code fixed in the way I explained: Also, your
was missing its closing tag. I also fixed your HTML which should be (no colon used in id attribute):
If you still have some questions about your code, leave a comment and I'll be happy to answer them. As far as I know, bootstrap or other popular CSS/JS libraries won't create any classes with . since the prefix doesn't get processed. It's possible the class you're seeing is a preprocessed version of bootstrap's classname, but most likely it's the name of your custom plugin or script that's creating it. A: You can do like this .login-box{ .color{ background-color: #7c5d5c; } } in this you are just making background-color as #7c5d5c and not setting a new classname. But you should give a proper class name. The thing is your code isn't using your class at all. Your code is setting background-color of class color which is not defined anywhere in your project. So if you just say color, it will search for color class and not color.class.