css

.ba {
    border-style: solid;
    border-width: 1px;
}

.bt {
    border-top-style: solid;
    border-top-width: 1px;
}

.lh-copy {
    line-height: 1.5;
}

.mw5 {
    max-width: 16rem;
}

.white {
    color: #fff;
}

.bg-near-black {
    background-color: #111;
}

.pa3 {
    padding: 1rem;
}

.pv2 {
    padding-top: .5rem;
    padding-bottom: .5rem;
}

.ph3 {
    padding-left: 1rem;
    padding-right: 1rem;
}

.mv0 {
    margin-top: 0;
    margin-bottom: 0;
}

.mv4 {
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.f4 {
    font-size: 1.25rem;
}

.f6 {
    font-size: .875rem;
}

.measure {
    max-width: 30em;
}

.center {
    margin-right: auto;
    margin-left: auto;
}

@media screen and (min-width: 30em) {
    .mw6-ns {
        max-width: 32rem;
    }

    .f5-ns {
        font-size: 1rem;
    }
}