basscraft.css

* { box-sizing: border-box }

body {
  font-family: Roboto, sans-serif;
  line-height: 1.5;
  margin: 0;
  color: #555;
  background-color: #fff;
}

.serif {
  font-family: Merriweather, serif;
}

a {
  color: inherit;
}

h1 { font-size: 2rem }
h2 { font-size: 1.5rem }
h3 { font-size: 1.25rem }
h4 { font-size: 1rem }
h5 { font-size: .875rem }
h6 { font-size: .75rem }

.h0 { font-size: 2rem }

@media screen and (min-width: 50em) {
  .h0 { font-size: 4vw }
}

hr {
  margin-top: 3em;
  margin-bottom: 3em;
  border: 0;
  border-bottom: 3px solid;
}

.btn {
  font-family: inherit;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  margin: 0;
  padding: .25em 1.25em;
  border: 2px solid;
  border-radius: 3px;
  color: inherit;
  background-color: transparent;
}

.btn:hover {
  box-shadow: inset 0 0 0 1px;
}

.black { color: #555 }
.white { color: #fff }
.red   { color: #f50 }
.blue  { color: #08d; color: #09b }
.green { color: #0a4 }
.purple { color: #a09 }

.bg-black { background-color: #555 }
.bg-white { background-color: #fff }
.bg-red   { background-color: #f50 }
.bg-blue  { background-color: #08d }
.bg-green { background-color: #0a5 }

.bd { border: 3px solid }
.bt { border-top:    3px solid }
.br { border-right:  3px solid }
.bb { border-bottom: 3px solid }
.bl { border-left:   3px solid }