.wrapper-hero {
  position: relative;
}
  
.overlay-hero {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  color: #FFFFFF;
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.4);
  z-index: 10;
  text-align: center;
}
  
.overlay-hero-button {
  position: absolute;
  bottom: 60px;
  z-index: 20;
}

@media screen and (min-width: 900px) {
  .hero-tagline {
    font-size: 60px;
  }
  
  .hero-description {
    font-size: 20px;
  }
}