我需要以某种方式放置文本的背景

body {
  background-image: url("wall.jpg");
  overflow-x: hidden;
}

.right {
  float: right;
  right: 0px;
  width: 50%;
  height: 340px;
}

.campaign {
  width: 100%;
  height: 600px;
  padding-top: 40px;
  padding-bottom: 40px;
}

.campaignblurb {
  float: left;
  width: 100%;
  background-color: red;
  text-align: left;
  vertical-align: middle;
  padding: 20px;
  opacity: 0.6;
  font-family: "Times New Roman", Times, serif;
  font-style: normal;
  font-weight: normal;
  font-size: 42px;
  line-height: normal;
  color: #000000;
}

.p2coop {
  float: left;
  width: 50%;
  font-family: "Times New Roman", Times, serif;
  font-style: normal;
  font-weight: normal;
  font-size: 36px;
  line-height: normal;
  color: #000000;
  background-color: grey;
  background-size: cover;
  text-align: left;
  vertical-align: left;
  opacity: 0.6;
  height: 340px;
  overflow: scroll;
}

.editorblurb {
  width: 50%;
  float: right;
  /* height: 350px; */
  font-family: "Times New Roman", Times, serif;
  font-style: normal;
  font-weight: normal;
  font-size: 35px;
  line-height: normal;
  color: #000000;
  right: 100px;
  background-color: grey;
  background-origin: padding-box;
  text-align: left;
  vertical-align: middle;
  padding: 20px;
  opacity: 0.6;
  margin-bottom: 20px;
}

.editor {
  width: 50%;
  height: 350px;
  float: left;
}

<div class="p2coop">
  Scrolling example with set height <br /><br /> The game’s two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, and two new player characters ATLAS and P-body, referred to as Blue and Orange by GLaDOS,
  a pair of bipedal Personality Construct based androids. This new mode forces players to reconsider everything they thought they knew about portals. Success will require them to not just act cooperatively, but to think cooperatively.
</div>
<img src="portal_atlas_pbody.jpg" class="right" />
<img src="portal2campaign.jpg" class="campaign" />
<div class="campaignblurb">
  The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements, and a much larger set of devious test chambers. Players will explore never-before-seen areas of the Aperture Science Labs and be reunited
  with GLaDOS, the occasionally murderous computer companion who guided them through the original game.
</div>
<div class="editorblurb">
  Removing the height example <br /><br /> The Puzzle Creator (also known as Puzzle Maker or Editor) is a part of the Perpetual Testing Initiative in Portal 2, allowing the creation of single-player and Co-op test chambers within a simple in-game editor.
</div>
<img src="leveleditor.jpg" class="editor" />