body {
    background-color: #333;
    margin: 0;
    padding: 0;
    font-family: Tahoma;
}

main {
    margin: 15px auto;
    text-align: left;
    padding: 30px;
    background-color: cornflowerblue;
    max-width: 800px;    
    border: 5px solid #333;
    outline: 5px solid navy;
}

div.logo {
    text-align: center;
    width: 100%;
    margin:0;
    padding:0;
}

div.logo img {
    width: 80%;
    max-width: 500px;
}

@media only screen and (max-width: 700px)
{
    main {
        max-width: 620px;
        padding: 10px;
    }
}