img { background-color: silver; border: 1px solid black; }
p { margin: 0px; text-align:center; }
a { color: black; font-family: sans-serif; text-decoration: none; }
a:hover { color: gray; }
a:hover img { border: 1px solid gray; }
.thumb { width: 120px; height: 120px; }
.app { float:left; width: 200px; height: 200px;  }
.box { margin: 10px; padding: 10px; border: 1px dotted gray; }
.panel { width:66%; margin: 60px auto; }