.header-image {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    rgba(45, 15, 101, 0.3),
    rgba(45, 15, 101, 0.3)
    ),
    url(../img/microphone.jpg);
  -webkit-background-size: cover;
  -moz-background-size: cover;
  background-size: cover;
  -o-background-size: cover;

  filter: blur(2px);
  /* Browser Specific*/
  -webkit-filter: blur(2px);
  -moz-filter: blur(2px);
  -o-filter: blur(2px);
  -ms-filter: blur(2px);
}