h2 {text-align: center;}
h3 {text-align: center;}
#outer {margin: auto; width: 60%;}
#expr {width:90%; padding:5px;}
#beware,#warning {font-family: sans-serif; font-size: small; font-weight:bold;padding-bottom: 2ex;}
#warning {text-align: center;}
#exprA,#exprB {width:70%; padding:5px;}
#pigeon,#logic,#clue {text-align:center; font-size: 14pt;}
#clues {width: 60%;}
#attrib,#individ {width: 3ex;}
#sudoku_instr {text-align: center; font-size: 10pt; font-weight: bold;}
.links {text-align: center;}
li {padding-bottom:2ex;}