.schedule {}
.schedule tr { vertical-align: top; }
.schedule tr td { font-weight: bold; padding: 0px; margin: 0px; }
.schedule tr td.discussion { font-weight: normal; border: 3px solid yellow; background: #FFFFC1; }
.schedule tr td.lecture { font-weight: normal; border: 3px solid #00FFCC; background: #C1FFFF; }
.schedule tr td.lab { font-weight: normal; border: 3px solid green; background: #66FF99; }
.schedule tr td.work { font-weight: normal; border: 3px solid red; background: #FF8080; }