Currently I'm trying to make it so that my content from .wrap-artist displays above the background image with a blur.
CSS
.wrap-artwork {
    left: 0;
    right: 0;
    z-index: 1;
    display: block;
    background-image: url('https://i1.sndcdn.com/artworks-000183268921-teibnr-t500x500.jpg');
    background-size: cover;
    background-position:center;
    height: 150px;
    margin-bottom: 20px;
    margin-top: -1px;
    margin-right: -16px;
    margin-left: -16px;
    -webkit-filter: blur(8px);
    -moz-filter: blur(8px);
    -o-filter: blur(8px);
    -ms-filter: blur(8px);
    filter: blur(8px);
}
.wrap-artist {
    position: relative;
    left: 0;
    right: 0;
    z-index: 9999;
    margin-left: 20px;
    margin-right: 20px;
}
.container {
   margin-top: 25px;
   max-width: 100%;
   margin-left: auto;
   margin-right: auto;
   background-color: #ffffff;
   border: 1px solid #ddd;
   width: 1080px;
   overflow: hidden;
   padding-bottom: 25px;
}
I've tried messing around with the positions but with the structure I'm using it doesn't seem to be working at all.
HTML
<div class="container">
    <div class="wrap-artwork"></div>
        <div class="wrap-artist">
        this is our image content
        </div>
    <div class="col-md-8">
        some other content here     
    </div>
    <div class="col-md-4">
        finally some sidebar content here
    </div>
</div>
Hopefully someone can help me, I used this question for guiding me but must have miss understood something in the first answer.
    .wrap-artwork {
  left: 0;
  right: 0;
  z-index: 1;
  display: block;
  background-image: url('https://i1.sndcdn.com/artworks-000183268921-teibnr-t500x500.jpg');
  background-size: cover;
  background-position:center;
  height: 150px;
  margin-bottom: 20px;
  margin-top: -1px;
  margin-right: -16px;
  margin-left: -16px;
  -webkit-filter: blur(8px);
  -moz-filter: blur(8px);
  -o-filter: blur(8px);
  -ms-filter: blur(8px);
  filter: blur(8px);
 }
 
    .wrap-artist {
  position: relative;
  left: 0;
  right: 0;
  z-index: 9999;
  margin-left: 20px;
  margin-right: 20px;
    }
    .container {
       margin-top: 25px;
       max-width: 100%;
       margin-left: auto;
       margin-right: auto;
       background-color: #ffffff;
       border: 1px solid #ddd;
       width: 1080px;
       overflow: hidden;
       padding-bottom: 25px;
    }
<div class="container">
  <div class="wrap-artwork"></div>
   <div class="wrap-artist">
   this is our image content
   </div>
  <div class="col-md-8">
   some other content here  
  </div>
  
  <div class="col-md-4">
   finally some sidebar content here
  </div>
</div>