.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--black);
  margin: 4px 0;
}

/* Mobile */
@media (max-width: 900px) {
  .main-nav {
    position: absolute;
    top: 80px;
    right: 0;
    background: #fff;
    width: 100%;
    display: none;
    border-top: 2px solid var(--blue);
  }

  .main-nav ul {
    flex-direction: column;
    padding: 20px;
  }

  .hamburger {
    display: flex;
  }

  .main-nav.active {
    display: block;
  }
}