.daohang a#courses { text-decoration: none; text-align: center; border-radius: 3px 3px 0 0; }
.blue .daohang a#courses { color: #3592e2 }
.green .daohang a#courses { color: #42b712 }
.orange .daohang a#courses { color: #f78015 }
.red .daohang a#courses { color: #EE4341 }
.daohang2 a#courses { color: #ffffff; border-radius: 3px 3px 0 0; }
.blue .daohang2 a#courses { background-color: #3592e2 }
.green .daohang2 a#courses { background-color: #42b712 }
.orange .daohang2 a#courses { background-color: #f78015 }
.red .daohang2 a#courses { background-color: #EE4341 }