h1   { text-align: center }
span.button { cursor: pointer }
td   { vertical-align: top }
div.center { text-align: center }
a.button { font: caption; }
td.center { text-align: center }
img.invisible { display: none }
span.mobile { position: absolute; cursor: default }
span.anchor { cursor: pointer; background-color:yellow  }