* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial;
}
        
body {
    background: #f4f4f4;
}

header {
    background: #a3ddff;
    color: #000;
    padding: 8px;
    text-align: center;
}

.box {
    display: flex;
    margin: 20px auto;
}

.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;
}

#list li {
    margin-bottom: 20px;
}

ol li {
    padding-left: 8px;
}

footer {
    background: #f4f4f4;
    color: #000000;
    text-align: center;
}

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