@media screen and (max-width: 900px) {
  header nav {
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    height: 0;
    background-color: rgba(42, 42, 42, 0.5);
    transition: height 0.8s;
    overflow: hidden;
  }

  header nav a {
    display: block;
    margin: 0;
    padding: 10px 0;
    border-bottom: #fff;
  }

  header .burger {
    display: block;
    width: 20px;
    height: 20px;
    position: relative;
    justify-self: end;
    cursor: pointer;
  }

  .burger-line1,
  .burger-line2,
  .burger-line3 {
    width: 20px;
    height: 2px;
    background: var(--text-color-lightest);
  }

  .burger-line1 {
    position: absolute;
    top: 0px;
  }

  .burger-line2 {
    position: absolute;
    top: 6px;
  }

  .burger-line3 {
    position: absolute;
    top: 12px;
  }

  #burger-btn:checked+nav {
    height: 200px;
  }

  .intro {
    margin: 10px 0 20px 0;
    max-width: 360px;
    font-size: 18px;
    color: #303030;
    text-align: left;
    line-height: 30px;
  }

  .swiper-container {
    position: relative;
    width: 100%;
    height: 50%;
    top: -80px;
    z-index: 50;
  }

  footer .footer-menus {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  footer .footer-menus .footer-menu {
    margin: 0 20px;
  }

  footer .menu-title {
    font-size: 20px;
    font-weight: 700;
    text-align: center;
  }

  footer .contact-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    max-width: 360px;
    margin-top: 10px;
    line-height: 28px;
    margin: auto;
  }

.cards-container {
    flex-direction: column;
    align-items: center;
    }

    .card {
        width: 80%;
        max-width: 500px;
    }
}