h1 { background: darkgreen; color: yellow; text-align: center; }
h2 { background: darkgreen; color: yellow; padding-top: 0.25em;}
.invisible { display: none; }
.box3 { background: #993366; text-align: center; margin:10px; color:#FFFFFF;}
.box2 { background: #ffffff; text-align: center; margin:10px}
.box4 { background: #993366; text-align: center; margin:10px}