<style>
body:before {
  content: "";
  display: block;
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: -10;
  background: url("https://cmsv2-assets.apptegy.net/uploads/11662/file/2546545/00340a28-db72-4a99-a264-ae744c582a45.png") no-repeat center center;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
   background-color: #aaaaaa;
    background-blend-mode: multiply;
}</p>
</style>