ul {
  margin-right: 50px;
  padding-left: 0px;
  list-style-type: none;
  float: left;
}
li {
  padding-top: 40px;
}
a {
  background-color: #ffff00;
}
table {
  background-color: #ffffff;
}
#top {
  background-image: url(./image/back.jpg);
}
#main {
  background-color: #ffff00;
}
.cell {
  background-image: url(./image/back.jpg);
}