@media screen and (max-width: 640px) {
  img {
    max-width: 100%;
    height: auto;
    width /***/:auto;
  }

  body {
    font-family: "Avenir Next";
  }

  li {
    list-style: none;
  }

  /*--------------------------------
    header
  ---------------------------------*/

  .header {
    color: #eeeeee;
    background-color: #222831;
    font-family: 'Open sans', sans-serif;
    font-weight: bold;
    /* height: 200px; */
    display: flex;
    
    
  }
  .header-container {
    margin-left: auto;
    margin-right: auto;
    display: flex;
    align-items: center;
  }

  .header-icon{
    margin-top: 4px;
    margin-bottom: 4px;
  }

  .header-icon img{
    border-radius: 50%;
    border-width: 4px;
    border-style: solid;
    margin-top: 2px;
    margin-left: 45px;
    width: 50%;
  }

  .header-info {
    /* background-color: tomato; */
    font-family: 'Open sans', sans-serif;
    margin-right: 10px;
  }

  .header-info img{
    border-radius: 50%;
    background-color: #eee;
  }

  .header-info h1{
    font-weight: normal;
    font-size: 32px;
    margin: 0;
    margin-bottom: 6px;
  }

  .header-info p{
    margin: 0;
    font-size: 18px;
    margin-bottom: 16px;
  }

  .header-info ul{
    margin: 0;
    padding: 0;
    list-style-type: none;
    display: flex;
    width: 60%;
  }

  .header-info ul li{
    margin-right: 8px;
  }

  /*--------------------------------
    sub
  ---------------------------------*/

  .sub {
    /* background-color: #3d5af1; */
    background-color: #393e46;
    height: 56px;
    font-family: 'Open sans', sans-serif;
    padding: 10px;
    box-shadow: 0px 3px 10px rgba(0,0,0,0.4);
    position:relative;
  }

  .sub-list ul{
    display: flex;
    justify-content: center;
    padding-left: 60px;
  }

  .sub-list li{
    font-weight: bold;
    font-size: 18px;
    display: inline-block;
    margin-right: 50px;
  }

  .sub-list li a{
    color: #00adb5;
    letter-spacing: -0.01em;
    text-decoration: none;
  }

  /*--------------------------------
    main
  ---------------------------------*/

  .main {
    background-color: #00adb5;
    color: #eeeeee;
    height: 400px;
    font-family: 'Open sans', sans-serif;
    padding: 10px;
    
  }


  /*--------------------------------
    section
  ---------------------------------*/

  .section {
    padding: 30px 10px;
    
  }

  .section-title {
    color: #eeeeee;
    text-align: center;
    margin-bottom: 30px;
    font-family: 'Open sans', sans-serif;
  }

  .section-body {
    color: #eeeeee;
    text-align: center;
    
  }

  /*--------------------------------
    footer
  ---------------------------------*/

  .footer {
    background-color: #eeeeee;
    height: 56px;
    font-family: 'Open sans', sans-serif;
    padding: 10px;
    
  }

  .footer-list ul{
    display: flex;
    justify-content: center;
    padding-left: 60px;
  }

  .footer-list li{
    font-weight: bold;
    font-size: 18px;
    display: inline-block;
    margin-right: 50px;
  }

  .footer-list li a{
    color: #222831;
    letter-spacing: -0.01em;
    text-decoration: none;
  }

  /* https://colorhunt.co/palette/2763 */
}