* {
    margin: 0;
    padding: 0;
    text-decoration: none;
}

:root {
    --ff-primary:'Francois One', sans-serif;
    --ff-secondary:'Harmattan', sans-serif;
}

#header {
    font-family: var(--ff-primary);
    display: flex;
    justify-content: space-between;
    padding: 1rem 2rem;
    color: #192745;
}

#body {
    background-color: rgba(9, 161, 209, .15);
    display: flex;
    justify-content: space-around;
    padding: 5rem 4rem;
}

#body .left {
    padding-right: 5rem;
}

.cover {
    width: 307px;
    height: 460px;
    filter: drop-shadow(-15px 15px 25px #000000)
}

.content {
    font-family: var(--ff-primary);
    color: #192745;
}

.content h1 {
    font-size: 3rem;
}

.content h4 {
    font-size: 1.5rem;
}

.content p {
    padding-top: 2rem;
    font-size: 1rem;
    color: #000000;
    font-family: var(--ff-secondary);
}

.buy-now {
    padding-top: 2rem;
    max-width: 40%;
}

.buy-now p {
    text-align: left;
    padding-top: 0;
    padding-left: 1.5rem;
}

#about {
    background-color: rgba(9, 161, 209, .15);
    font-family: var(--ff-secondary);
    font-size: .8rem;
    text-align: right;
    padding-right: 4rem;
}

.author {
    width: 89px;
    height: 70px;
    padding-right: 3rem;
}

.contact p {
    padding-right: 3.5rem;
}

.publisher-logo {
    width: 121px;
    height: 32px;
}

#footer {
    background-color: rgba(9, 161, 209, .15);
    font-family: var(--ff-secondary);
    text-align: center;
}

.info {
    display: flex;
    justify-content: space-between;
    padding: 2rem 4rem;
}

@media screen and (max-width:640px) {
    #header {
        padding: 1rem;
        align-items: center;
    }

    .price h2 {
        font-size: .8rem;
    }

    #body {
        flex-direction: column;
        padding-top: 2rem;
        padding-bottom: 2rem;
    }

    #body .left {
        text-align: center;
        padding-bottom: 2rem;
        padding-right: 0;
    }

    .buy-now {
        text-align: center;
        padding-top: 2rem;
        max-width: 100%;
    }

    .buy-now p  {
        text-align: center;
        padding-left: 0;
    }

    #about {
        text-align: center;
        padding-right: 0;
        padding-bottom: 2rem;
    }

    .contact  p{
        padding-right: 0;
    }

    .contact .author {
        padding-right: 0;
    }

    .info {
        flex-direction: column-reverse;
    }
}

@media screen and (max-width:400px) {
    .content h1 {
        font-size: 2rem;
    }

    .content h4 {
        font-size: 1.15rem;
    }
    
    .cover {
        width: 257px;
        height: 360px;
    }
}