.content-header {
  background-image: url(/img/product/renewable_energy/geothermal/bg_header_index.jpg);
  background-position-x: center;
}
.bg-gray{
  background-color: #F2F2F2;
  border:#0c76bc 1px dashed;
  padding:20px;
  margin:0 auto;
  max-width:500px;
}
.bg-gray .txt{
  margin:20px 0px 0px;
}
@media screen and (max-width: 500px) {
  .content-header {
    background-image: url(/img/product/renewable_energy/geothermal/bg_header_index_sp.jpg);
  }
}