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.bg {
  width: 100%;
  height: 100%;
  background: url("bg.jpg") center center no-repeat;
  background-size: cover;
}

.bg:before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image: linear-gradient(to bottom right, #002f4b, #dc4225);
  opacity: .6;
}