.container {
  display: flex;
  gap: 10px;
}

.box {
  width: 60px;  
  height: 40px; 
  background: red;
  color: aliceblue;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid black;

  
}
.box:nth-child(even) {
 display: none;
}