body {
    overflow: hidden !important;
    background-color: #efefef !important;
}


.back-btn {
    position: fixed;
    top: 15px;
    right: 15px;
    z-index: 100;
    cursor: pointer;
}

.bb-custom-wrapper h3 {
	font-size: 1.4em;
	font-weight: 300;
	margin: 0.4em 0 1em;
}

.bb-custom-wrapper nav {
	width: 100%;
	height: 30px;
	margin: 1em auto 0;
	position: relative;
	z-index: 0;
	text-align: center;
}

.bb-custom-wrapper nav a {
	display: inline-block;
	width: 30px;
	height: 30px;
	text-align: center;
	border-radius: 2px;
	background: #72b890;
	color: #fff;
	font-size: 0;
	margin: 2px;
}

.bb-custom-wrapper nav a:hover {
	opacity: 0.6;
}

.bb-custom-icon:before {
	font-family: 'arrows';
	speak: none;
	font-style: normal;
	font-weight: normal;
	font-variant: normal;
	text-transform: none;
	line-height: 1;
	font-size: 20px;
	line-height: 30px;
	display: block;
	-webkit-font-smoothing: antialiased;
}

.bb-custom-icon-first:before,
.bb-custom-icon-last:before {
	content: "\e002";
}

.bb-custom-icon-arrow-left:before,
.bb-custom-icon-arrow-right:before {
	content: "\e003";
}

.bb-custom-icon-arrow-left:before,
.bb-custom-icon-first:before {
	-webkit-transform: rotate(180deg);
	transform: rotate(180deg);
}



.main-box.bb-main-box {
    margin-top: 40px;
    width: 90%;
    /* background-color: red; */
    aspect-ratio: 2/1;
    margin-left: auto;
    margin-right: auto;
}

@media screen and (min-aspect-ratio: 2/1)  {
    .main-box.bb-main-box {
        width: unset;
        height: calc(100vh - 80px);
    }
}





.bb-bookblock {
    width: 100%;
    height: 100%;
    /* background-color: #72b890; */
    margin: 0 auto;
    position: relative;
    z-index: 100;
    -webkit-perspective: 1300px;
    perspective: 1300px;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform: scale(1);
}

.bb-custom-wrapper .bb-bookblock.shadow {
    box-shadow: 0 12px 20px -10px rgba(81,64,49,0.6);
}


.page-img {
    width: 100%;
}

.bb-bookblock .first-item {
    width: 50%;
    margin-left: 50%;
}

.bb-bookblock .last-item {
    width: 50%;
    margin-right: 50%;
}


.next-page {
    width: 50%;
    height: 100%;
    right: 0px;

}

.cover-shadow-left {
    width: 50%;
    height: 100%;
    position: absolute;
    top:0px;
    left:0px;
    box-shadow: 0 12px 20px -10px rgba(81,64,49,0.6);
}

.cover-shadow-right {
    width: 50%;
    height: 100%;
    position: absolute;
    top:0px;
    right:0px;
    box-shadow: 0 12px 20px -10px rgba(81,64,49,0.6);
}

.prev-page {
    width: 50%;
    height: 100%;
    left: 0px;
}


.page-btn {
    position: absolute;
    top:0px;
    z-index: 100;
    cursor: pointer;
}


.bb-custom-wrapper {
    
    width: 100%;
    height: 100%;
    /* background-color: aqua; */
    position: relative;
    margin: 0 auto 40px;
    text-align: center;
}



.bb-page {
    position: absolute;
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
    -webkit-transition-property: -webkit-transform;
    transition-property: transform;
}

.bb-vertical .bb-page {
    width: 50%;
    height: 100%;
    left: 50%;
    -webkit-transform-origin: left center;
    transform-origin: left center;
}

.bb-horizontal .bb-page {
    width: 100%;
    height: 50%;
    top: 50%;
    -webkit-transform-origin: center top;
    transform-origin: center top;
}

.bb-page > div,
.bb-outer,
.bb-content,
.bb-inner {
    position: absolute;
    height: 100%;
    width: 100%;
    top: 0;
    left: 0;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.bb-vertical .bb-content {
    width: 200%;
}

.bb-horizontal .bb-content {
    height: 200%;
}

.bb-page > div {
    width: 100%;
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d;
}

.bb-vertical .bb-back {
    -webkit-transform: rotateY(-180deg);
    transform: rotateY(-180deg);
}

.bb-horizontal .bb-back {
    -webkit-transform: rotateX(-180deg);
    transform: rotateX(-180deg);
}

.bb-outer {
    width: 100%;
    overflow: hidden;
    z-index: 999;
}

.bb-overlay, 
.bb-flipoverlay {
    background-color: rgba(0, 0, 0, 0.7);
    position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    opacity: 0;
}

.bb-flipoverlay {
    background-color: rgba(0, 0, 0, 0.2);
}

.bb-bookblock.bb-vertical > div.bb-page:first-child,
.bb-bookblock.bb-vertical > div.bb-page:first-child .bb-back {
    -webkit-transform: rotateY(180deg);
    transform: rotateY(180deg);
}

.bb-bookblock.bb-horizontal > div.bb-page:first-child,
.bb-bookblock.bb-horizontal > div.bb-page:first-child .bb-back {
    -webkit-transform: rotateX(180deg);
    transform: rotateX(180deg);
}

/* Content display */
.bb-content {
    /*background: #fff;*/
}

.bb-vertical .bb-front .bb-content {
    left: -100%;
}

.bb-horizontal .bb-front .bb-content {
    top: -100%;
}

/* Flipping classes */
.bb-vertical .bb-flip-next,
.bb-vertical .bb-flip-initial {
    -webkit-transform: rotateY(-180deg);
    transform: rotateY(-180deg);
}

.bb-vertical .bb-flip-prev {
    -webkit-transform: rotateY(0deg);
    transform: rotateY(0deg);
}

.bb-horizontal .bb-flip-next,
.bb-horizontal .bb-flip-initial {
    -webkit-transform: rotateX(180deg);
    transform: rotateX(180deg);
}

.bb-horizontal .bb-flip-prev {
    -webkit-transform: rotateX(0deg);
    transform: rotateX(0deg);
}

.bb-vertical .bb-flip-next-end {
    -webkit-transform: rotateY(-15deg);
    transform: rotateY(-15deg);
}

.bb-vertical .bb-flip-prev-end {
    -webkit-transform: rotateY(-165deg);
    transform: rotateY(-165deg);
}

.bb-horizontal .bb-flip-next-end {
    -webkit-transform: rotateX(15deg);
    transform: rotateX(15deg);
}

.bb-horizontal .bb-flip-prev-end {
    -webkit-transform: rotateX(165deg);
    transform: rotateX(165deg);
}

.bb-item {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: none;

}

/* No JS */
.no-js .bb-bookblock, 
.no-js ul.bb-custom-grid li {
    width: auto;
    height: auto;
}

.no-js .bb-item {
    display: block;
    position: relative;
}