@media only screen and (min-width: 599px) and (max-resolution: 199dpi) {

  a { 
    color: #50991c;
    text-decoration: none;
    font-weight: bold;
  }

  body {
    background-color: #dee6d8;
    padding: 0px;
    margin: 0px;
    display: flex;
    justify-content: center;
  }

  #page_body {
    flex: 1;
    max-width: 1000px;
    min-height: calc( 100vh - 20px );
    background-color: white;
    margin: 0px;
    padding-top: 10px;
    padding-bottom: 10px;
    border-left: solid 2px darkolivegreen;
    border-right: solid 2px darkolivegreen;
    display: flex;
    flex-direction: column;
  }

  #header {
    display: flex;
    flex-direction: row;
    margin-left: 10px;
    margin-right: 10px;
    border-bottom: solid 1px lightgrey;   
  }

  #header_logo {
    width: 156px;
    padding-bottom: 10px;
    cursor:pointer;
    border-bottom: solid 2px rgba(0,0,0,0);
    margin-bottom: -2px;
  }

  #header_logo:hover {
    /* background-color: #def1d1; */
    border-bottom: solid 2px #5aaf1d;
  }

  #header_logo_top {
    width: 100%;
    /*height: 100%;*/
  }

  /*
  #header_logo_bottom {
    visibility: hidden;
    height: 0px;
  }
*/
  #header_logo_bottom {
    width: 100%;
  }

  #header_padding {
    flex: 1;
  }

  #header_menu {
    width: 500px;
    display: flex;
    flex-direction: column;
    margin-left: 3px;
  }

  #header_menu_top {
    flex: 1;
  }

  #header_menu_bottom {
    display: flex;
    flex-direction: row;
    justify-content: space-evenly;
    align-items: flex-start;
    border-right: solid 1px lightgrey;
    height: 30px;
  }

  #header_menu_bottom > div {
    height: 30px;
    border-bottom: solid 2px rgba(0,0,0,0);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    color: #172b08;
    margin-bottom: 15px;
    text-align: center;
    cursor:pointer;
  }

  #header_menu_bottom > div:hover {
    color: #418015;
    border-bottom: solid 2px #5aaf1d;
  }

  #header_menu_bottom > div > a {
    text-decoration: none;
    color:inherit;
    display: inline-block;
    height: 100%;
  }

  #header_menu_contribute {
    /* color: #2eCC71 !important; */
    color: #5aaf1d !important;
    font-weight: bold;
  }

  #header_title {
    color: #418015;
    width: 60%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }

  #header_title h1 {
    font-family: Verdana, sans-serif;
    color: #418015;
    text-align: left;
    font-size: 2rem;
    font-weight: bold;
    margin: 0px;
  }

  #header_title h2 {
    font-family: Verdana, sans-serif;
    color: #172b08;
    text-align: left;
    font-size: 1.5rem;
    margin: 0px;
  }

  #header_submenu {
    display: flex;
    flex-direction: row;
    margin-left: 10px;
    margin-right: 10px;
    justify-content:space-evenly;
    border-bottom: solid 1px lightgrey;
    padding: 0px;
    margin-left: 10px;
    margin-right: 10px;
  }

  #header_submenu > a {
    color: darkslategrey;
    font-family: Verdana, sans-serif;
    font-size: 16px;
    font-weight:normal;
    margin: 3px;
    margin-bottom: -2px;
    padding-bottom: 3px;
    border-bottom: solid 2px rgba(0,0,0,0);
  }

  #header_submenu > a:hover {
    border-bottom: solid 2px #5aaf1d;
  }

  #main {
    display: flex;
    /* margin-top: 30px; */
    padding-top: 30px;
    margin-left: 10px;
    margin-right: 20px;
    justify-content: space-evenly;
    width: calc( 100vw - 20px);
    max-width: calc( 100% - 20px);
  }

  #main > div {
    color: #172b08;
    flex: 0.3;
    background-color: #F7F7F7;
    padding: 10px;
    border-radius: 10px;
    text-align: center;
  }

  #main_text {
    color: #172b08;
    flex: 1 !important;
    display: block !important;
    text-align: justify !important;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14pt;
    width: 80% !important;
    line-height: 1.3;
  }

  #main_text h2 {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18pt;
    margin: 0px;
    margin-bottom: 10px;
  }

  .main_code, .main_filetree {
    font-size: 10pt;
    overflow-x: scroll;
    overflow-y: scroll;
    max-width: 100%;
    max-height: 500px;
    padding: 10px;
    color: #172b08;
    background-color: #dee6d8;
    border: solid 1px darkgreen;
  }

  .main_filetree {
    background-color: lightgrey;
    border-color: grey;
    padding: 0px;
    overflow: auto;
  }

  .main_code, .main_filetree > pre {
    font-family: 'Courier New', monospace;
    font-size: 11pt;
    margin: 5px;
  }

  .main_logo1 {
    width: 0px;
    height: 0px;
    visibility: hidden;
  }

  .main_logo1 > img {
    max-width: 0px;
    max-height: 0px;
  }

  .main_title {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 24px;
    font-weight: bold;
    /* color: #418015; */
    text-align: center;
    padding-top:10px;
    padding-bottom:10px;
    height: 50px;
  }

  .main_logo2 {
    width: 90%;
    border: solid 1px lightgrey;
    border-radius: 50%;
    background-color: white;
    text-align: center;
  }

  .main_logo2 > img {
    width: 50%;
    padding: 12%;
  }

  .main_description {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    padding-top:30px;
    padding-bottom:10px;
    padding-left: 5px;
    padding-right: 5px;
    text-align: justify;
    min-height: 100px;
  }

  .main_button {
    font-family: Verdana, sans-serif;
    font-size: 16px;
    font-weight: bold;
    margin-top:10px;
    margin-bottom:10px;
    padding: 7px;
    padding-left: 15px;
    padding-right: 15px;
    background-color: #50991c;
    color: white;
    border-radius: 3px;
    border: none;
    cursor: pointer;
  }
  
  .main_button:hover {
    background-color: #418015;
  }

  #main_padding {
    background-color: lemonchiffon;
  }

}