A small CSS problem _ basic Tutorial

Let me ask you a question.
I want the following table to class= a class name from table to achieve my underlying effect
Is that I want to define a class in CSS, put the cellspacing=1 bgcolor= #D0DDE5 and TD in the table
Bgcolor= #FFFFFF are all written into a class of CSS, and I'll just use the table class to implement it,
Please teach me.

<table width= "100%" cellspacing= "1" bgcolor= "#D0DDE5" > <tr> <td bgcolor= "#FFFFFF" > I want to put the C in the table Ellspacing=1 bgcolor= #D0DDE5 and TD bgcolor= #FFFFFF are written in a CSS class, how to write </td> </tr> </table>
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<style type= "Text/css" > tablecss{border:1px solid #D0DDE 5; } </style> <table width= "100%" class= "Tablecss" > <tr> <td bgcolor= "#FFFFFF" > I want to put the Cellspacing=1 bgcolor= #D0DDE5 and TD bgcolor= #FFFFFF are written in a class of CSS, how to write </td> </tr> </TABLE&G T
[ctrl+ A Select all Note: If you need to introduce external JS need to refresh to execute the