body{
background:#f5f6fa;
font-family:Arial,sans-serif;
}

.sidebar{
position:fixed;
width:240px;
height:100vh;
background:#111827;
color:white;
padding:25px;
}

.sidebar a{
display:block;
color:white;
text-decoration:none;
padding:12px 0;
}

.content{
margin-left:260px;
padding:30px;
}

.card-box{
border-radius:15px;
padding:25px;
background:white;
box-shadow:0 5px 20px #ddd;
}