site/_src/_assets/styles/page-whitepaper.scss

.page-whitepaper {
    .content--page--markdown {
        > p:nth-child(1),
        > p:nth-child(2) { text-align: center; }
    }

    #get-the-whitepaper {
        + a {
            @extend .btn, .btn-primary;
        }
    }
}