.flex-container {
  display: flex;
  background-color: #530000;
    flex-direction: column;
      flex-wrap: wrap;
      justify-content: center;
      align-items: center
 Width: 100%
  background-color: darkgrey;
  margin: 10px;
  padding: 20px;
  font-size: 30px;
}


<div id="flex">
<div class="flex-container">

  <div>  <img src ="gambit3.jpg" alt="d"style="width:756px;height:518px;"></div>
  <div>2</div>
  <div>3</div>  
</div>