change color of column in html based on value

 I am extracting output of query from sqlplus in html format.I need to change color of column based on values greater than or equal to 30 .

please suggest?

query used is as follows:

set verify off;

set timing off;

set markup html on spool on;

spool \DataBase_Team\Tablespace_Tracker\TBS.html;

conn expusr/expu33r@east_bbsr_01;

column Current_Date_and_Time format A20;

SELECT TO_CHAR(SYSDATE,'MONTH DD,YYYY : HH:MI:AM') "Current_Date_and_Time" FROM DUAL;

COLUMN DATABASENAME FORMAT A18;

select 'BBSR'|| name "DatabaseName" from v$database;

col "Tablespace" for a22

col "USED SPACE (GB)" for 99,999,999.00