.main_area {
  font-family: 'arial', 'sans-serif', 'helvetica', 'sans-serif', 'Lucida Grande', 'Hiragino Kaku Gothic ProN', 'ヒラギノ角ゴ ProN W3', 'Meiryo', 'メイリオ';
  line-height: 1.3em;
}
.main_area p {
  line-height: 1.8em;
}
.main_area h2 {
  text-align: right;
  font-size: 14px;
  margin: 20px 0;
}
a {
  text-decoration: underline;
}
th,
td {
  vertical-align: top;
  padding-top: 1em;
}
th {
  font-size: 120%;
  text-align: center;
}
th:nth-child(1) {
  width: 100px;
  background: #eaeaea;
  background: -webkit-linear-gradient(45deg, transparent 51px, transparent 51px), -webkit-linear-gradient(135deg, transparent 51px, transparent 51px), -webkit-linear-gradient(225deg, #eaeaea 10px, #eaeaea 10px), -webkit-linear-gradient(315deg, #eaeaea 10px, #eaeaea 10px);
  background: -moz-linear-gradient(45deg, transparent 51px, transparent 51px), -moz-linear-gradient(135deg, transparent 51px, transparent 51px), -moz-linear-gradient(225deg, #eaeaea 10px, #eaeaea 10px), -moz-linear-gradient(315deg, #eaeaea 10px, #eaeaea 10px);
  background: -o-linear-gradient(45deg, transparent 51px, transparent 51px), -o-linear-gradient(135deg, transparent 51px, transparent 51px), -o-linear-gradient(225deg, #eaeaea 10px, #eaeaea 10px), -o-linear-gradient(315deg, #eaeaea 10px, #eaeaea 10px);
  background: -ms-linear-gradient(45deg, transparent 51px, transparent 51px), -ms-linear-gradient(135deg, transparent 51px, transparent 51px), -ms-linear-gradient(225deg, #eaeaea 10px, #eaeaea 10px), -ms-linear-gradient(315deg, #eaeaea 10px, #eaeaea 10px);
  background-position: bottom left, bottom right, top right, top left;
  background-size: 100px 80px;
  background-repeat: no-repeat;
}
th:nth-child(2) {
  width: 160px;
}
td {
  width: 600px;
}
th:nth-child(2),
td {
  border-top: 1px solid #C0C0C0;
}
th .step_number {
  font-size: 200%;
  line-height: 2em;
}
td iframe {
  width: 500px;
  height: 305px;
  border: solid 1px #cdcdcd;
}
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