.burger {
  display: none
}
@media (max-width:48em) {
  .burger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 6.8rem;
    height: 6.8rem;
    flex-shrink: 0;
    position: relative;
    z-index: 1
  }
  .burger span {
    width: 4.4rem;
    height: .4rem;
    background-color: #1e5d9d;
    transition: .25s
  }
  .burger span:nth-child(1),
  .burger span:nth-child(2) {
    margin-bottom: 1rem
  }
  .burger_active span:nth-child(1) {
    transform: rotate(45deg);
    margin-bottom: -.2rem
  }
  .burger_active span:nth-child(2) {
    transform: rotate(-45deg);
    margin-bottom: 0;
    margin-top: -.2rem
  }
  .burger_active span:nth-child(3) {
    display: none
  }
}