SASS include parent styles

I am trying to find a way to include the parents styles within nested styles. In the code below, I want to include the width and box-sizing that are set on .random-div in the two nested styles too, so that .random-div--large would have width, box-sizing and padding all set.

.random-div {
    width: 100%;
    box-sizing: border-box;

    &--large {
        padding: 65px 45px;
    }

    &--small {
        padding: 25px 15px;
    }
}

I've tried extending the parent class within the nested ones but that includes all of the other nested styles too. Is there any way to just include the parent styles?

Create a placeholder and use that.

%random-div {
    width: 100%;
    box-sizing: border-box;
}

.random-div {
    &--large {
        @extend %random-div;
        padding: 65px 45px;
    }

    &--small {
        @extend %random-div;
        padding: 25px 15px;
    }
}

This will compile to:

.random-div--large, .random-div--small {
     width: 100%;
     box-sizing: border-box;
}
 .random-div--large {
     padding: 65px 45px;
}
 .random-div--small {
     padding: 25px 15px;
}