@media only screen and (min-device-width: 320px) and (max-device-width: 480px) {
  .mobile_only {
    display: block;
  }
  .desktop_only {
    display: none;
  }
  .container,
  #illustrations,
  header {
    width: 100%;
  }
  #illustrations {
    background: none;
    text-align: center;
  }
  #illustrations div {
    text-align: center;
    width: auto;
  }
  #illustrations div img {
    display: inline;
  }
  header .logo {
    text-align: center;
    display: block;
    margin: auto;
  }
  header .logo img {
    width: 150px;
  }
  header ul {
    display: none;
  }
  #intro .container {
    padding: 15px 0;
  }
  #intro form {
    margin-bottom: 0;
  }
  #intro h1 {
    font-size: 15pt;
    padding-bottom: 20px;
    color: #d81378;
  }
  #intro h3 {
    font-size: 12pt;
  }
  #intro .sweetcaptcha {
    padding: 10px;
    border: 0;
    box-shadow: none;
  }
  .textual p {
    font-size: 12pt;
    padding: 0 10px;
    line-height: 140%;
  }
  #about {
    padding-top: 15px;
  }
  #solved,
  #solved h5 {
    font-size: 14pt;
  }
  #solved h5 {
    padding-bottom: 10px;
    color: #d81378;
  }
  #solved i {
    display: inline-block;
    margin: 0px 3px;
    width: 25px;
    height: 40px;
    background: url("/images/mini/counter.png") no-repeat left top;
    background-size: 100% 100%;
    font-size: 12pt;
    line-height: 40px;
  }
  #join img {
    width: 300px;
  }
  #join2 {
    font-size: 12pt;
  }
  #join2 a {
    font-size: 12pt;
    margin-top: 10px;
    margin-left: 0;
  }
  #illustrations h2 {
    font-size: 13pt;
    color: #d81378;
  }
  #illustrations div h3 {
    font-size: 12pt;
  }
  #illustrations p {
    font-size: 11pt;
    padding: 0 10px;
    line-height: 140%;
  }
  #illustrations div,
  #illustrations div:nth-child(2),
  #illustrations div:nth-child(4) {
    padding-bottom: 60px;
  }
  #illustrations div:nth-child(5) {
    padding-bottom: 0;
  }
  footer h3 {
    display: none;
  }
  footer ul li {
    display: none;
  }
  footer ul li:last-child {
    display: block;
    text-align: center;
    width: 100%;
  }
  #accounts {
    line-height: 130%;
  }
  #accounts.signup.signup h1,
  #accounts.signin.signup h1 {
    font-size: 17pt;
  }
  #accounts.signup.signup h2,
  #accounts.signin.signup h2 {
    font-size: 15pt;
    line-height: 130%;
    padding-bottom: 10px;
  }
  #accounts,
  #accounts .row {
    width: 96% !important;
    padding: 0;
  }
  #faq .container h1 {
    color: #d81378;
    font-size: 14pt;
    text-align: center;
    background: #eee;
    padding: 10px 0;
    margin-bottom: 10px;
  }
  #faq .container .span3,
  #faq .container .span7 {
    width: 95%;
    margin: 0 2%;
  }
  #faq .container ul.choose li {
    float: left;
    margin-right: 5px;
  }
  #faq .container ul.choose li a {
    font-size: 11pt;
    padding: 7px 14px;
  }
  #faq .container ul.section {
    border: 0;
  }
  #faq .container ul.section li {
    font-size: 10pt;
    line-height: 140%;
  }
}