.hole-front {
width: 200px; height: 30px; position: absolute; bottom: 0;
background: url('./mole-hole-front.png') center center no-repeat;
background-size: 200px 30px;
}
</style>
</head>
<body>
<div>
<span id="timer">0</span>초
<span id="score">0</span>점
<button id="start">시작</button>
</div>
<div id="game">
<div class="row">
<div class="cell">
<div class="hole"></div>
<div class="gopher hidden"></div>
<div class="bomb hidden"></div>
<div class="hole-front"></div>
</div>
<div class="cell">
<div class="hole"></div>
<div class="gopher hidden"></div>