html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: auto;

  font-family: Arial, Helvetica, sans-serif;

  /* Permalink - use to edit and share this gradient: https://colorzilla.com/gradient-editor/#b2e1ff+0,66b6fc+100;Blue+3D+%236 */
  background: radial-gradient(ellipse at center,  rgba(178,225,255,1) 0%,rgba(102,182,252,1) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
}

a {
  color: #07F;
}

.hidden {
  display: none;
  opacity: 0;
  z-index: -999;
  position: fixed;
  top: -1000px;
  left: -1000px;
  height: 1px;
  width: 1px;
  border: 0 none;
  background: none;
  font-size: 1px;
  color: transparent;
}