css

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

.b--black-10 {
    border-color: rgba(0, 0, 0, .1);
}

.db {
    display: block;
}

.tracked {
    letter-spacing: .1em;
}

.lh-title {
    line-height: 1.25;
}

.link {
    text-decoration: none;
    transition: color .15s ease-in;
}

.link:link, .link:visited {
    transition: color .15s ease-in;
}

.link:hover {
    transition: color .15s ease-in;
}

.link:active {
    transition: color .15s ease-in;
}

.link:focus {
    transition: color .15s ease-in;
    outline: 1px dotted currentColor;
}

.mw5 {
    max-width: 16rem;
}

.w-100 {
    width: 100%;
}

.gray {
    color: #777;
}

.bg-white {
    background-color: #fff;
}

.pa3 {
    padding: 1rem;
}

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

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

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

.ttu {
    text-transform: uppercase;
}

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

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

.dim {
    opacity: 1;
    transition: opacity .15s ease-in;
}

.dim:hover, .dim:focus {
    opacity: .5;
    transition: opacity .15s ease-in;
}

.dim:active {
    opacity: .8;
    transition: opacity .15s ease-out;
}