*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial, Helvetica, sans-serif;
}

body{
    height:100vh;
    overflow:hidden;
    background:#f4f6f9;
}

.container{
    display:flex;
    height:100vh;
}

.sidebar{
    width:270px;
    background:#1f2937;
    color:#fff;
    overflow-y:auto;
    transition:.3s;
}

.sidebar h2{
    padding:20px;
    background:#111827;
    text-align:center;
}

.sidebar ul{
    list-style:none;
}

.sidebar li{
    padding:18px 20px;
    cursor:pointer;
    border-bottom:1px solid rgba(255,255,255,.1);
    transition:.3s;
}

.sidebar li:hover{
    background:#2563eb;
}

.content{
    flex:1;
    position:relative;
}

#contentFrame{
    width:100%;
    height:100%;
    border:none;
    background:white;
}

#menuBtn{
    position:absolute;
    top:15px;
    left:15px;
    z-index:999;
    padding:10px 16px;
    border:none;
    border-radius:6px;
    background:#2563eb;
    color:white;
    cursor:pointer;
    display:none;
}

#menuBtn:hover{
    background:#1d4ed8;
}