header {
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid #ddd;
  background: #ffb3a6;
  width: 100%;
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 99;
  max-width: 900px;
}
header a {
  font-size: 2.5rem;
  font-weight: 700;
  background: url("../img/ball.png") no-repeat 0 50% / 3rem;
  padding-left: 4rem;
  color: #7a1200;
}

main {
  margin-top: 6.6rem;
  padding: 2rem;
}

#wrap {
  max-width: 900px;
  margin: 0 auto;
}