<!-- https://opentutorials.org/module/2367/13464의 수업 예제  -->
<div id="empty"></div>
<div id="normal">normal</div>
 #empty{
            margin-top:50px;
            margin-bottom: 100px;
/*            border:1px solid tomato;*/
        }
        #normal{
            background-color: powderblue;
            margin-top:100px;
        }
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