How to pass parameters to css classes

Question

I want to know is it possible to add some flexibility to css via this:

where .round i

Answer 1

You can't define the border radius separate from its value because it's all one property. There's no way to tell an element to have rounded corners "in general" without also specifying how much to round them by.

However, you can do something kind of similar with multiple classes and different properties:

HTML:

CSS:

.rounded {
    border-radius: 5px;
}
.blue {
    background: blue;
}
.green {
    background: green;
}

The .rounded class adds the border radius and the .blue and .green classes add the background color.

(I like to name and order the classes such that they read logically, like

, etc.).