A utility CSS class for removing margins on first and last child elements. For more info, see https://philkurth.com.au/tips/a-utility-css-class-for-removing-margins-on-first-and-last-child-elements/

remove-margins-from-first-and-last-elements.css

.m-0-first-last > :first-child {
    margin-top: 0;
}

.m-0-first-last > :last-child {
    margin-bottom: 0;
}

remove-margins-from-first-and-last-elements.scss

// Define a mixin so we can use this anywhere we need it
@mixin first_last_marginless() {
    > :first-child {
        margin-top: 0;
    }

    > :last-child {
        margin-bottom: 0;
    }
}

// Set up a utility class using the mixin
.m-0-first-last {
    @include first_last_marginless;
}