chota/src/_nav.css

.nav {
    display: flex;
    min-height: 5rem;
    align-items: stretch;
}

.nav > .container {
    display: flex;
}

.nav-center,
.nav-left,
.nav-right {
    display: flex;
    flex-basis: 0;
    flex-grow: 1;
    flex-shrink: 0;
}

.nav-left {
    justify-content: flex-start;
}

.nav-right {
    justify-content: flex-end;
}

.nav-center {
    justify-content: center;
}

@media screen and (max-width: 480px) {
  .nav, .nav>.container {
    flex-direction: column;
  }
  .nav-center,
  .nav-left,
  .nav-right {
    flex-basis: 100%;
    justify-content: center;
    flex-shrink: 1;
    flex-grow: 0;
    flex-wrap: wrap;
  }
}

.nav .brand {
    display: flex;
    align-items: center;
    margin: 0;
}

.nav a {
    text-decoration: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 1rem 2rem;
}