html
                 <div class="wrapper">
  <div class="myBox"></div>
</div>
 
            

        
css
                 .wrapper {
  background: #de712e;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 50vh;
}

.myBox {
  width: 800px;
  height: 100px;
  border: 1px solid white;
}

 
            

            
js