.introduction {
  background: url("../img/top/bg/bg.jpg") no-repeat center;
  -webkit-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  position: relative;
}
.introduction:before {
  content: '';
  display: block;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}
.introduction h2 {
  position: relative;
  z-index: 5;
}
.introduction .lead {
  position: relative;
  margin-left: 60px;
  padding-top: 128px;
  z-index: 5;
}