.sig {
    padding-left: 4rem;
}

.sig>:first-child {
    margin-left: -4rem;
}

.sig-param::before {
    content: "\a";
    white-space: pre;
}

.sig>.sig-param:last-of-type::after {
    content: ",\a";
    white-space: pre;
}

.sig-param+.sig-paren {
    margin-left: -4rem;
}

.sig-param>:first-child {
    margin-left: -2rem;
}