@media only screen and (max-width: 640px) {
  .st-width {
    width: 300px; 
  }

  section {
    font-size: 26px;
  }
  section#photos ul li {
    float: left;
    width: 300px;
    height: 300px;
    margin-right: 0;
    overflow: hidden;
  }

  header {
    position: relative;
    height: 120px;
  }

  header nav {
    display: none;
  }

  section#about {
    margin-top: 0;
  }
  #about .heart {
    display: none;
    background: none;
  }
  section#about .st-width {
    width: 300px;
    padding-top: 0;
  }

  #sponsors ul li,
  #sponsors ul li.last {
    background-position: top center;
    text-align: center;
    width: 220px;
    margin: 0 auto;
    float: none;
  }

  #sponsors > div > p {
    font-size: 32px;
  }

  #registration_form {
    padding: 15px;
  }

  #registration_form fieldset {
    width: auto;
  }

  #registration_form .thank-you-text {
    width: auto;
    float: none;
  }

  #registration_form input {
    width: 270px;
  }

  section#location {
    height: auto;
    background: none;
  }
  .map-wrap {
    height: auto;
    overflow: inherit;
    position: static;
    bottom: inherit;
    width: inherit;
  }
  .map-wrap address {
    position: static;
    background: #fff;
    padding:20px;
    color: #484848;
    opacity: 1;
    text-align: center;
  }
}