styles/chartcss/_dropdown.scss

.dropdown {
  select {
    font-size: 12px;
    color: #444;
    padding: 5px;
    border: 1px solid #aaa;
    box-shadow: 0 1px 0 1px rgba(0, 0, 0, 0.04);
    border-radius: 0.5em;

    &:hover {
      border-color: #888;
    }

    &:focus {
      border-color: #aaa;
      box-shadow: 0 0 1px 3px rgba(59, 153, 252, 0.7);
      box-shadow: 0 0 0 3px -moz-mac-focusring;
      color: #222;
      outline: none;
    }

    option {
      font-weight: normal;
    }
  }
}