* {
    box-sizing: border-box;
    margin: 0px;
    padding: 0px;
}

body {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    background-color: #0000CC;
    color: white;
}

.bold {
    font-weight: bold;
}

.underscore {
    text-decoration: underline;
}

a {
    color: white;
}

h1 {
    margin-bottom: 1rem;
}

h2 {
    margin-bottom: 1rem;
}

img {
    width: 100%;
    object-fit: contain;
}

p {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

ul {
    margin-left: 2rem;
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.book {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-wrap: nowrap;
    align-items: flex-start;
}

header,
main {
    margin: 2rem;
}

header {
    display: flex;
    flex-direction: column-reverse;
    flex-wrap: nowrap;
    justify-content: flex-end;
    gap: 1rem;
}

.buy_now img {
    height: 25px;
    width: auto;
}

form {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.cover {
    width: 100%;
    max-width: 500px;
}

.description {
    width: 100%;
}

.title {
    font-size: 1.5rem;
}

.also_available a {
    display: block;
    margin-top: 0.5rem;
}

@media (min-width: 1000px) {
    .book {
        flex-direction: row;
        align-items: flex-start;
    }

    .cover {
        width: 40%;
    }

    .description {
        width: 60%;
    }
}