a {
  color: black
}

#header {
  height:500px;
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

#header h1 {
  font-size: 4rem
}

#header:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 500px;
  background-image: url(../images/services.jpg);
  background-size: cover;
  filter: blur(16px);
  z-index: -1;
}