body {
  padding: 0;
  width: 450px;
  margin: auto;
  font-size: 100%;
  line-height: 1.5;
  font-family: "Helvetica", sans-serif;
}
h1,
h2,
h3,
h4 {
  margin: 1em 0 0.5em;
  line-height: 1.25;
}
h1 {
  font-size: 2em;
}
h2 {
  font-size: 1.5em;
}
h3 {
  font-size: 1.2em;
}
ul,
ol {
  margin: 1em 0;
  padding-left: 40px;
}
p,
figure {
  margin: 1em 0;
}
a img {
  border: none;
}
sup,
sub {
  line-height: 0;
}
.center {
  text-align: center;
  font-weight: 700;
}