body {
    margin          : 0;
    background-image: url('./img/bac.png');
    width           : 100%;
}

* {
    box-sizing: border-box;
}

.book-section {
    /* height    : 100vh;
    width     : 100%; */
    padding   : 20px 0;
    text-align: center;
}

.book-section>.container {
    height          : 500px;
    width           : 700px;
    position        : relative;
    left            : 20%;
    transform       : translateX(-50%);
    border-radius   : 2%;
    margin-bottom   : 30px;
    /* perspective  : 1200px; */
}

.container>.right {
    position       : absolute;
    height         : 100%;
    width          : 50%;
    transition     : 0.7s ease-in-out;
    transform-style: preserve-3d;
}

.book-section>.container>.right {
    right           : 0;
    transform-origin: left;
    border-radius   : 10px 0 0 10px;
}

.right>figure.front,
.right>figure.back {
    margin             : 0;
    height             : 100%;
    width              : 100%;
    position           : absolute;
    left               : 0;
    top                : 0;
    background-size    : 100%;
    background-repeat  : no-repeat;
    backface-visibility: hidden;
    background-color   : white;
    overflow           : hidden;
}

.right>figure.front {
    background-position: right;
    border-radius      : 0 10px 10px 0;
    box-shadow         : 2px 2px 15px -2px rgba(0, 0, 0, 0.2);
}

.right>figure.back {
    background-position: left;
    border-radius      : 10px 0 0 10px;
    box-shadow         : -2px 2px 15px -2px rgba(0, 0, 0, 0.2);
    transform          : rotateY(180deg);
}

.flip {
    transform: rotateY(-180deg);
}

.flip::before {
    content         : "";
    position        : absolute;
    top             : 0;
    left            : 0;
    z-index         : 10;
    width           : 100%;
    height          : 100%;
    border-radius   : 0 10px 10px 0;
    background-color: rgba(0, 0, 0, 0.1);
}

.book-section>button {
    border          : 2px solid #ef9f00;
    background-color: transparent;
    color           : #ef9f00;
    padding         : 10px 20px;
    border-radius   : 5px;
    cursor          : pointer;
    margin          : 10px;
    transition      : 0.3s ease-in-out;
}

.book-section>button:focus,
.book-section>button:active {
    outline: none;
}

.book-section>p {
    color      : rgba(0, 0, 0, 0.7);
    font-family: calibri;
    font-size  : 24px;
}

.book-section>p>a {
    text-decoration: none;
    color          : #ef9f00;
}

.book-section>button:hover {
    background-color: #ef9f00;
    color           : #fff;
}

.front#cover,
.back#back-cover {
    background-color: #ffcb63;
    text-align      : left;
    padding         : 0 30px;
}

.front#cover h1 {
    color: #fff;
}

.front#cover p {
    color    : rgba(0, 0, 0, 0.8);
    font-size: 14px;
}

.form-control {
    background   : rgb(209 206 206 / 39%) !important;
    border-radius: 10px !important;
    padding      : 10px !important;
}

.bg-black {
    background: #000;
}

.f-right {
    float: right;
}

.dk-header {
    display: block;
}

.mb-header {
    display: none;
}

@media only screen and (max-width:767px) {
    .dk-header {
        display: none;
    }

    .mb-header {
        display: block;
    }

    .book-section>.container {
        height       : 300px;
        width        : auto;
        position     : relative;
        left         : 0%;
        transform    : translateX(0%);
        border-radius: 2%;
        margin-bottom: 30px;
    }
    .bg-img {
        background-image: url('./img/header.png');
        width           : 100%;
    }

}

.bg-img {
    background-image: url('./img/header.png');
    width           : 100%;
}