@media only screen and (max-width: 900px) {
  /* MENU */
  #nav-bg {
    display: none;
  }

  .nav-section {
    position: absolute;
    padding: 30px 0;
    background-color: #fff;
    right: 0;
    top: 0;
    width: 90%;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    border-bottom-left-radius: 30px;
    border-left: 6px solid #000000;
  }

  ul.nav-section li a {
    font-size: 20px;
    text-align: center;
    line-height: 3rem;
  }

  .nav-section .nav-link:nth-child(2) {
    margin-left: 0px;
  }

  .nav-section .nav-link:nth-child(3) {
    margin-left: 0px;
  }

  .nav-section .nav-link:nth-child(4) {
    margin-left: 0px;
  }

  .nav-section .nav-link:nth-child(5) {
    margin-left: 0px;
  }

  .nav-section .nav-link:nth-child(6) {
    margin-left: 0px;
  }

  #nav-line {
    position: relative;
    z-index: 2;
    top: auto;
    right: auto;
    width: 120px;
  }
  /* MENU */

  .brand-motto h2 {
    font-size: 2rem;
  }

  .content-wrapper {
    flex-direction: column;
    margin: 0 50px;
  }

  .profile-wrapper {
    display: flex;
    flex-direction: column;
    margin: 0 50px;
    align-items: center;
  }

  .profile-img {
    margin: 0;
  }

  .profile-img img {
    margin: 0;
  }

  .introduction {
    width: 100%;
  }

  /* ACHIEVEMENT */
  .achieve-section {
    height: 430px;
  }

  .dark-banner {
    height: 250px;
    top: 50px;
  }

  .achieve-title {
    flex-direction: column;
    height: 308px;
    margin: 20px 0;
  }

  .white-banner {
    height: 308px;
  }

  .achieve-title h2 {
    width: 100%;
    text-align: center;
    font-size: 32px;
    margin-bottom: 16px;
  }

  .achieve-reward {
    display: flex;
    justify-content: space-around;
  }

  .achieve-reward img {
    margin: 0 10px;
    height: 180px;
  }

  .social-wrapper {
    position: relative;
    right: auto;
    bottom: auto;
    margin: 20px 0;
  }

  /* ACHIEVEMENT */

  /* FOOTER */

  /* FOOTER */
}