body::before {
  content: '';
  position: fixed;
  top: 20%;
  right: 0;
  bottom: 0;
  left: 0;
  background-image: url('pix/kerosakura.png');
  background-repeat: no-repeat;
  background-position: right top;
  background-size: contain;
  z-index: -1;
  pointer-events: none;
}

body {
  margin: 0 auto;
  padding: 2em;
  font-family: monospace;
  background-color: #ffff99;
  color: #7f7f00;
  max-width: 700px;
}

nav {
  margin-bottom: 2em;
}

nav a,
ul a {
  color: #7f7f00;
  text-decoration: none;
  border-bottom: 1px solid #7f7f00;
  margin-right: 1em;
  font-size: 1.1em;
}

a {
  color: #7f7f00;
  text-decoration: none;
  border-bottom: 1px solid #7f7f00;
}

nav a:hover,
a:hover,
ul a:hover {
  border-bottom: none;
}

h1 {
  font-size: 2.2em;
  margin-bottom: 0.5em;
}

main, footer, header {
  text-align: center;
}

ul {
  list-style-position: inside;
  padding-left: 0;
  text-align: left;
  display: inline-block;
}