a {
  color: #0077aa;
}

body {
  margin: 40px auto;
  max-width: 727px; /* wysi */
  line-height: 1.6;
  font-size: 16px;
  color: #444;
  padding: 0 10px;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

.center {
  display: flex;
  justify-content: center;
  flex-direction: column;
  align-items: center;
}