Optimizing css classes in webpack?

Question

webpack

Greetings!
When building a project, when compiling scss > css, in css I notice a lot of classes that could be optimized.
Available at the output:

.element_1 {
    color: red;
}
.element_2 {
    color: red;
}

I would like the output to be:

.element_1, .element_2 {
    color: red;
}

How to properly configure WebPack to solve such a problem?
Thank you!