.collaborator-modal{
    .selected-user {
        @include normalize-listing;
        display: grid;
        margin: 0px -1rem;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto;
        align-items: center;

        & > li {
            padding: 1rem;
        }

        .form-checkbox {
            margin: 0px;
        }
    }

    table{
        th,
        td{
            &:last-child() {
                text-align: right;
            }
        }

        .fa-check{
            color: $forrest-green;
        }

        .fa-times{
            color: $apple-blossom;
        }
    }

    .error-message{
        margin-top: .5rem;
    }
}

.collaborator-modal{
    .selected-user {
        @include normalize-listing;
        display: grid;
        margin: 0px -1rem;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto;
        align-items: center;

        & > li {
            padding: 1rem;
        }

        .form-checkbox {
            margin: 0px;
        }
    }

    table{
        th,
        td{
            &:last-child() {
                text-align: right;
            }
        }

        .fa-check{
            color: $forrest-green;
        }

        .fa-times{
            color: $apple-blossom;
        }

        button {
            & + button{
                margin-left: .4rem !important;
            }
        }
    }

    .error-message{
        margin-top: .5rem;
    }
}

Add some spacing between buttons
Add some spacing between buttons
