.bgc {background-color:#fca;}
.top {position: absolute; top: 5px; left: 5px;}
main {position: relative; width:700px; margin-left: auto; margin-right: auto;}

.hr {border: none; border-top: 2px solid #333; border-bottom: 2px solid #333;
  height: 4px;}
.cr1 {background-color: #ffc;}
.cr2 {background-color: #cff;}
.fs {font-size: small;}