.flex-container {
  margin-top: 20px;
  display: flex;
  flex-wrap: nowrap;
  width: 100%;
  height: 600px;
  justify-content: center;
  transition: 2s all ease;
  background-color: #2c2c2c;
}

.flex-item {
  background: cyan;
  border: 1pt solid black;
  width: 10px;
  transition: 0.1s all ease;
}