*{
    box-sizing: border-box;
}

body {
    margin:20px;
    background-color: rgb(136,136,80);
    transition:background-color 2s;
}

img {
    max-width: 100%;
}

header {
    background-color: blanchedalmond;
    text-align:center;
    padding:10px;
    margin-bottom: 10px;
}

main {
   display:flex;
   gap:10px;
   margin-bottom:10px; 
}

main nav, main div, footer {
    padding:10px;
    background-color: blanchedalmond;
}

nav {
    width:25%;
}

.center {
    width:50%;
}

.details {
    width:25%;
}

footer {
    text-align: center;
}

.secret {
    text-align: center;
    background-color:red;
    font-size:20px;
    border-radius: 50%;
    padding:20px;
    margin-bottom:10px;
    display:none;
}
/*
    min-width = mobile-first design 
    - scalable 
    - constrained form (result is most sites now look the same)

    max-width = desktop-first design
    - more work to make responsive 
    - more diverse forms and layouts

*/

@media screen and (max-width:800px) {
    body {
        background-color: rgb(229,173,112);
    }

    main {
        flex-wrap:wrap;
    }

    nav, .center, .details {
        width:100%;
    }

    .secret {
        display:block;
    }
}

@media screen and (max-width:600px) {
    body {
        background-color:rgb(244, 164, 244);
        font-size:200%;
    }
}