div.content-window {
  width: 95%;
  margin: 20px auto;
  padding: 35px;
  background-color: rgba(0,0,0,0.9);
  box-sizing: border-box;
}

div.content-window {
  width: 85%;
  margin: 20px auto;
  padding: 35px;
  background-color: rgba(0,0,0,0.9);
  box-sizing: border-box;
}

Make content window less dominant
Make content window less dominant

Shrinks the width of the content window to let more of the background
through.
