Spacing between label and input box

Spacing between label and input box

index.php
<div class="detail">
<?php echo Form::label("first_name", "First Name"); ?>
<?php echo Form::input("first_name", $userdetails->first_name); ?>
</div>
I am getting the output in the below format mentioned in image,i want some
space between first name and input box.What css property i should apply.