css

.db {
    display: block;
}

.dib {
    display: inline-block;
}

.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;
}

.mid-gray {
    color: #555;
}

.pv4 {
    padding-top: 2rem;
    padding-bottom: 2rem;
}

.ph2 {
    padding-left: .5rem;
    padding-right: .5rem;
}

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

.mt3 {
    margin-top: 1rem;
}

.tc {
    text-align: center;
}

.ttu {
    text-transform: uppercase;
}

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

.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;
}

@media screen and (min-width: 30em) and (max-width: 60em) {
    .ph5-m {
        padding-left: 4rem;
        padding-right: 4rem;
    }
}

@media screen and (min-width: 60em) {
    .ph6-l {
        padding-left: 8rem;
        padding-right: 8rem;
    }
}