body{
    font-family: -apple-system,BlinkMacSystemFont,Helvetica,Arial;
    margin:auto;
    max-width:900px;
    padding:40px;
    line-height:1.7;
    background:#fafafa;
    color:#222;
    }
    
    nav{
    margin-bottom:40px;
    }
    
    nav a{
    margin-right:20px;
    color:#2a5db0;
    text-decoration:none;
    font-weight:500;
    }
    
    nav a:hover{
    text-decoration:underline;
    }
    
    .container{
    background:white;
    padding:40px;
    border-radius:8px;
    box-shadow:0 2px 10px rgba(0,0,0,0.05);
    }
    
    details{
    margin-top:5px;
    }