html - CSS can't select classes/id's with numbers in it? -

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i ran problem.

i gave div other divs in class named center , 400-width. means div has centered , have width of 400. 

<div class="center 400-width" id="position"> <div class="" id="header"> header </div> <div class="" id="content"> content </div> <div class="" id="footer"> footer </div> </div>

the css selects class 400-width means container gets width of 400px. , background-color checking if it's true.

.400-width{     width:400px;     background-color:blue;     color:white; }

it doesn't happen right can see: http://jsfiddle.net/gekkeabt/xqje4/1/

i solved problem replacing 400- four. becomes fourwidth

but question is. why can't use numbers in css , there way of doing job?

thanks!

i have faced same problem.... not problem anyway..

instead of '.400-width' use '.width-400'


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