I want the background to have an opacity of .8 but not affect the other elements on top. How can I do this?
HTML
<div id="background">
<div id="foreground">
<div class="row">
  <div class="column">
    <div class="card">
      <img src="lee2.png" alt="Jane" style="width:200px; height:200px">
      <div class="container">
        <h2>Lee Hannigan</h2>
        <p class="title">CEO & Founder</p>
        <p>Some text that describes me lorem ipsum ipsum lorem.</p>
        <p>lee@stokeddesigns.com</p>
        <p><button class="button">Contact</button></p>
      </div>
    </div>
  </div>
  <div class="column">
    <div class="card">
      <img src="bosco2.png" alt="Mike" style="width:200px; height:200px;">
      <div class="container">
        <h2>Bosco</h2>
        <p class="title">Lead Developer</p>
        <p>Some text that describes me lorem ipsum ipsum lorem.</p>
        <p>bosco@stokeddesigns.com</p>
        <p><button class="button">Contact</button></p>
      </div>
    </div>
  </div>
  <div class="column">
    <div class="card">
      <img src="cat2.png" alt="John" style="width:200px;height:200px;">
      <div class="container">
        <h2>Caitriona Lyons</h2>
        <p class="title">Designer</p>
        <p>Some text that describes me lorem ipsum ipsum lorem.</p>
        <p>cat@stokeddesigns.com</p>
        <p><button class="button">Contact</button></p>
      </div>
    </div>
  </div>
</div>
</div>
</div>
CSS
/* Three columns side by side */
.column {
    float: left;
    width: 25%;
    margin-bottom: 16px;
    margin-left:70px;
    padding: 0 8px;
    background-color: grey;
}
.card {
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}
.container {
    padding: 0 16px;
}
/* Clear floats */
.container::after, .row::after {
    content: "";
    clear: both;
    display: table;
    }
.title {
    color: #453A3A;
}
.button {
    border: none;
    outline: 0;
    display: inline-block;
    padding: 8px;
    color: white;
    background-color: #000;
    text-align: center;
    cursor: pointer;
    width: 100%;
}
.button:hover {
  background-color: #555;
}
#background{
    background-color: #ED9300;
    opacity:0.8;
    }
#foreground{
text-align: center;
margin-top: 100px;
padding: 50px;
}
 
     
     
    