If you want to change the color on your check ticket status form in osTicket v1.6 RC5, then you may implement this following modification by editing the \styles\colors.css and \include\client\login.inc.php files. This modification also will answer the question in osTicket Discussion Forum that asking about this modification.
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Open your \styles\colors.css file, and find this code:
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hr { border:none; border-bottom:1px solid #ccc; margin:10px 0 10px 0; }
after that line, please insert this following code:
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.labelloginclient { color:blue; } .textloginclient { background:#999eee; }
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Open your \include\client\login.inc.php file, and find this code:
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<table cellspacing="1" cellpadding="5" border="0" bgcolor="#000000" align="center"> <tr bgcolor="#EEEEEE"> <td>E-Mail:</td><td><input type="text" name="lemail" size="25" value="<?=$e?>"></td> <td>Ticket ID:</td><td><input type="text" name="lticket" size="10" value="<?=$t?>"></td>then replace with this following code:
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<table cellspacing="1" cellpadding="5" border="0" bgcolor="#000000" align="center"> <tr bgcolor="#EEEEEE"> <td><span class="labelloginclient">E-Mail:</span></td><td><input type="text" name="lemail" size="25" value="<?=$e?>" class="textloginclient"></td> <td><span class="labelloginclient">Ticket ID:</span></td><td><input type="text" name="lticket" size="10" value="<?=$t?>" class="textloginclient"></td>
If you want to change the form background color, then you may change the “#EEEEEE” value above become the other value. Hope it helps.

Here is an easier way:
add the following to the php page in question:
It works in ie, firefox, chrome
Don’t forget to add the style css brackets. My way bypasses the css files included in osticket, and applies the new set inside the page itself.