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區塊置中 & 順眼的form CSS style

memo: 

1. margin: auto ; <---> margin: 0 auto  ;

DEMO LIKE:

<style type="text/css">
<!--

form {

/* set width in form, not fieldset (still takes up more room w/ fieldset width */
font:100% verdana,arial,sans-serif;
margin: auto;
padding: 0;
min-width: 500px;
max-width: 600px;
width: 560px;
position:absolute; height:280px;
top:0; bottom:0; left:0; right:0;

}

form fieldset {

/ * clear: both; note that this clear causes inputs to break to left in ie5.x mac, commented out */
border-color: #000;
border-width: 1px;
border-style: solid;
padding: 10px; /* padding in fieldset support spotty in IE */
margin: 0;

}

form fieldset legend {

font-size:1.1em; /* bump up legend font size, not too large or it'll overwrite border on left */
/* be careful with padding, it'll shift the nice offset on top of border */

}

form label {

display: block; /* block float the labels to left column, set a width */
float: left;
width: 150px;
padding: 0;
margin: 5px 0 0; /* set top margin same as form input - textarea etc. elements */
text-align: right;

}

form fieldset label:first-letter {

/* use first-letter pseudo-class to underline accesskey, note that */
text-decoration:underline; /* Firefox 1.07 WIN and Explorer 5.2 Mac don't support first-letter */
/* pseudo-class on legend elements, but do support it on label elements */
/* we instead underline first letter on each label element and accesskey */
/* each input. doing only legends would lessens cognitive load */
/* opera breaks after first letter underlined legends but not labels */

}

form input, form textarea {

/* display: inline; inline display must not be set or will hide submit buttons in IE 5x mac */
width:auto; /* set width of form elements to auto-size, otherwise watch for wrap on resize */
margin:5px 0 0 10px;

/* set margin on left of form elements rather than right of label aligns textarea better in IE */

}

form input#reset {

margin-left:0px; /* set margin-left back to zero on reset button (set above) */

}

textarea { overflow: auto; }

form small {

display: block;
margin: 0 0 5px 160px; /* instructions/comments left margin set to align w/ right column inputs */
padding: 1px 3px;
font-size: 88%;

}

form .required{font-weight:bold;} /* uses class instead of div, more efficient */

form br {

clear:left; /* setting clear on inputs didn't work consistently, so brs added for degrade */

}

-->
</style>