body{
    font-family: Arial, sans-serif;
    background:#f4f6f8;
    margin:0;
}
header{
    background:#0a58ca;
    color:white;
    padding:15px;
    text-align:center;
}
nav a{
    color:white;
    margin:0 10px;
    text-decoration:none;
    font-weight:bold;
}
.container{
    padding:20px;
}
.box{
    background:white;
    padding:15px;
    margin-bottom:15px;
    border-radius:5px;
}
.btn{
    background:#0a58ca;
    color:white;
    padding:10px 15px;
    text-decoration:none;
    border-radius:4px;
    display:inline-block;
}
footer{
    background:#222;
    color:#ccc;
    text-align:center;
    padding:10px;
}