.dev_main {
  width: 70%;
  margin-left: 15%;
}
.dev_main h2 {
  font-size: 36px;
  text-align: center;
  font-weight: normal;
  border-bottom: 1px solid #ccc;
  padding-bottom: 3%;
}
.dev_main .detai_main {
  text-align: center;
}
.dev_main .detai_main h3 {
  font-weight: normal;
}
.dev_main .detai_main h4 {
  font-weight: normal;
}
.dev_main .detai_main p {
  font-size: 14px;
  letter-spacing: 3px;
  color: #9e9a9a;
  text-align: left;
  line-height: 36px;
}