body:has(main) main {
  background-image: url(../img/3juu_haikei.gif);
}

body:not(:has(main)) {
  background-image: url(../img/3juu_haikei.gif);
}

table {
  border-right: 2px solid #2c2c2c;
  border-bottom: 2px solid #2c2c2c;
  border-top: 2px solid #808080;
  border-left: 2px solid #808080;
  margin-left: auto;
  margin-right: auto;
  background-color: #c9c9c9;
  width: 75%;
}

td,
th {
  border-right: 1px solid #808080;
  border-bottom: 1px solid #808080;
  border-top: 1px solid #2c2c2c;
  border-left: 1px solid #2c2c2c;
}

td.name {
  width: 30%;
}