<body>
    <div id="wrap">
        <div id="header">
            <div class="container"></div>
        </div>
        <div id="nav">
            <div class="container"></div>
        </div>
        <div id="main">
            <div class="contents container clearfix">
                <div class="cont1"></div>
                <div class="cont2"></div>
                <div clss="con_sel">
                    <div class="cont3"></div>
                    <div class="cont4"></div>
                </div>
            </div>
        </div>
        <div id="footer">
            <div class="container">
            </div>
        </div>
    </div>
</body>
<style>
        * {
            margin: 0;
            height: 0;
        }
        #wrap {
            width: 100%;
            margin: 0 auto;
            background-color: #000;
        }
        #header {
            width: 100%;
            height: 100px;
            background-color: #EEEBE9;
        }
        #nav {
            width: 100%;
            height: 100px;
            background-color: #B9AAA5;
        }
        #main {
            width: 100%;
            height: 780px;
            background-color: #886F65;
        }
        #footer {
            width: 100%;
            height: 100px;
            background-color: #4E342E;
        }
        .container {
            width: 1200px;
            height: inherit;
            margin: 0 auto;
            background-color: rgba(0,0,0,0.3);
        }
        .contents .cont1 {
            width: 100%;
            height: 100px;
            background-color: #74574A;
        }
        .contents .cont2 {
            width: 100%;
            height: 200px;
            background-color: #684D43;
        }
        .con_sel{
            width: 100%;
            height: 480px;
            overflow: hidden;
        }
        .contents .cont3 {
            width: 50%;
            height: 480px;
            background-color: #594139;
            float: left;
        }
        .contents .cont4 {
            width: 50%;
            height: 480px;
            background-color: #4A352F;
            float: left;
        }
        /*
            float으로 인한 영역깨짐 방지법
            1. 깨지는 영역에 clear : both를 설정한다.
            2. 부모 박스 영역에  overflow : hidden을 설정한다.
            3. clearfix를 설정한다.
        */
        .clearfix::before,
        .clearfix::after {
            content: '';
            display: block;
            line-height: 0;
        }
        .clearfix::after {
            clear: both;
        }
        @media (max-width: 1220px) {
            .container {
                width: 96%;
            }
        }
        @media (max-width: 768px) {
            .container {
                width: 100%;
            }
        }
        @media (max-width: 480px) {
            
        }
    </style>

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