.nav-header {
  border-bottom: 2px solid #000;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  background-color: #fff;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}