.aligned p span {
	width: 118px;
	text-align: right;
	display: inline-block;
}

	<div class="aligned">
		<p><span>Username:</span><input type="text" maxlength="30" id="username" /></p>
		<p><span>Password:</span><input type="password" maxlength="30" id="password" /></p>
		<p><span>Confirm Password:</span><input type="password" maxlength="30" id="passwordconf" /></p>
		<p><span>Email:</span><input type="text" maxlength="30" id="email" /></p>
		<p><span>Confirm Email:</span><input type="text" maxlength="30" id="emailconf" /></p>
		<p><input type="button" value="Submit" onclick="submitPressed();" /></p>
	</div>