问CSS中div内文本的左右边距(ident)

EN

<div class="stage_container_four">
<?php
  if ($answer == $correct && $refer_question == 0) {
            echo $xp_value," ", "Points earned.";
            }
            else {
            echo "Already answered or wrong answer.";
            }
?>
</div>

.stage_container_four {
    margin-left:50px;
    margin-top:20px;
    height: 30px;
    float:left !important;
    font-family: Oxygen, sans-serif;
    font-size:12px;
    color:rgba(160,78,0,1.00);
    line-height: 30px;
    text-indent: 20px;
    text-transform:none !important;
    background-color:rgba(255,202,0,0.70);
    border-radius: 25px;
}