BEM — is a methodology that helps you to create reusable components and code sharing in front‑end development

Learn why it's better
Classic CSS
#opinions_box h1 {
    margin: 0 0 8px 0;
    text-align: center;
}

#opinions_box {
    p.more_pp {
        a {
            text-decoration: underline;
        }
    }

    input[type="text"] {
        border: 1px solid #ccc!important;
    }
}
BEM
.opinions-box {
    margin: 0 0 8px 0;
    text-align: center;

    &__view-more {
        text-decoration: underline;
    }

    &__text-input {
        border: 1px solid #ccc;
    }

    &--is-inactive {
        color: gray;
    }
}

Easy

To use BEM, you only need to employ BEM’s naming convention.

Modular

Independent blocks and CSS selectors make your code reusable and modular.

Flexible

Using BEM, methodologies and tools can be recomposed and configured the way you like.