* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
        
body {
    background: #9fff80;
}

header {
    background: #9fff80;
    color: #000;
    padding: 20px;
    text-align: center;
}

/*nav {
    background: #00b300;
    padding: 12px;
    text-align: center;
}

nav a {
    color: #000;
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
    font-size: 18px;
}

nav a:hover {
    text-decoration: underline;
}

.navigation {
    position: sticky;
    top: 0;
    z-index: 1000;
}*/

.box {
    display: flex;
    margin: 20px auto;
    background-color: #f4f400;
}

.textbox {
    display: block;
    margin: 20px auto;
    width: 720px;
    text-align: justify;
}

.imgcenter {
    display: block;
    margin: 0 auto;
    width: 720px;
    margin-bottom: 20px;
}

#buku p {
    margin-bottom: 20px;
}

footer {
    background: #b3ff66;
    color: #000000;
    text-align: center;
}

@media (max-width: 600px) {
    body {
        width: 100vh;
    }
}