.sc_index_header {
  width: 100%;
  height: 510px;
}
.sc_index_header_t {
  width: 100%;
  height: 50px;
  background-color: #454545;
  position: relative;
}

.sc_index_header_btn {
  width: 300px;
  height: 30px;
  background-color: #fff;
  line-height: 30px;
  font-size: 16px;
  color: #454545;
  position: absolute;
  right: 20px;
  top: 10px;
  border-radius: 5px;
  text-align: center;
  font-weight: bold;
}

.sc_index_header_b {
  width: 100%;
  height: 460px;
}
.sc_index_header_b img {
  width: 100%;
  height: 460px
}