.boxback8{
  background:#FF884B
}
.header257 {
  background-color: #4a3b2c;
  color: white;
  padding: 20px;
  text-align: center;
  font-size: 24px;
  font-weight: bold; /* 太字に設定 */
}

.container3{
  width: 100%;
  max-width: 860px;
  margin-right: auto;
  margin-left: auto;
  padding-top: 20px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.container260{
  padding-right: 15px;
  padding-left: 15px;
  margin-right: auto;
  margin-left: auto;
  border-radius: 6px;
  max-width: 100%;
  padding-top: 20px;
  padding-bottom: 20px;
}