here my css and html, how to make my opacity on my background only with not effect my word inside container.
<style>
.x1 {
background-color: #ffb3b3;
opacity:0.1;
}
.x2 {
background-color: #ffe6e6;
}
.x3 {
background-color: #ffe6e6;
}
</style>
here my `html`<div class="container">
    <div class="row">
        <div class="col-md-8 col-md-offset-2"><center><h1>Dashboard</h1></center></div>
    </div>
    <div class="row">
      <div class="col-sm-3 x1">
          asd
      </div>
      <div class="col-sm-1">
      </div>
      <div class="col-sm-3 x2">
          sadsd
      </div>
      <div class="col-sm-1">
      </div>
      <div class="col-sm-4 x3">
          sdas
      </div>
    </div>
    <div class="row">
      <div class="col-12">
    </div>
</div> 
    