reader.css

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

body {
    overflow: hidden;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;

    font-family: sans-serif;
    background-color: #AD8365;
}
/* Book */
.book {
    position: relative;
    width: 480px;
    height: 720px;
    transition: transform 0.5s;
}

.paper {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    perspective: 1500px;
    

}

.loadbearing {
    visibility: hidden;
}

.front,
.back {
    background-color: white;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    transform-origin: left;
    transition: transform 0.5s;
}

.front {
    z-index: 1;
    backface-visibility: hidden;
}

.back {
    z-index: 0;
}

.front-content,
.back-content {
    width: 100%;
    height: 100%;
    display: grid;
    justify-content:center;
    text-align: justify;
    line-height: 16pt;
    align-items: center;

    grid-template-columns: auto;
    grid-template-rows: auto;
    gap: 0px;
}

#chapter-header {
    margin-left: 20%;
    margin-top: 35%;
    font-family: Garamond;
    font-size: x-large;
}

#chapter-bar {
    margin-left: 20%;
    margin-bottom: 28%;
    font-family: Garamond;
    font-size: x-large;
}

#indent{
    font-family: Garamond;
    text-indent: 5%;
    font-size: 11pt;
}
#no-indent {
    font-family: Garamond;
    font-size: 11pt;
}
#story-break, #page-end {
    font-family: Garamond;
    text-align: center;
    padding-bottom: 10pt;
    font-size: 11pt;
}

.back-content > #no-indent, .back-content > #indent {
    margin-right: 6%;
    margin-left: 12%;
}

.front-content > #no-indent, .front-content > #indent {
    margin-left: 6%;
    margin-right: 12%;
}

#page-start {
    margin-bottom: 8%;
}
#page-end {
    margin-top: 1%;
    bottom: 15px;
    font-size: 11pt;
}

.back-content {
    transform: rotateY(180deg);
    border-right: 1px solid black;
}

.front-content > img {
    height: 100%;
    width: 100%;
    user-select: none;
}

/* Paper flip effect */
.flipped .front,
.flipped .back {
    transform: rotateY(-180deg);
}

/* Controller Buttons */
button {
    z-index: 2;
    border: none;
    background-color: transparent;
    cursor: pointer;
    margin: 5%;
    transition: transform 0.5s;
}

button:focus {
    outline: none;
}

button:hover i {
    color: black;
}

i {
    font-size: 50px;
    color: black;
}

/* Paper stack order */
#p1 {
    z-index: 10;
}
#p2 {
    z-index: 9;
}
#p3 {
    z-index: 8;
}
#p4 {
    z-index: 7;
}
#p5 {
    z-index: 6;
}
#p6 {
    z-index: 5;
}
#p7 {
    z-index: 4;
}
#p8 {
    z-index: 3;
}
#p9 {
    z-index: 2;
}
#p10 {
    z-index: 1;
}

#prev-btn {
    display: none;
}

#chapter-cover, #chapter-mobile, #chapter-back {
    position: absolute;
    top: 38%;
    right: 15%;
    align-self: center;
    background: rgba(12,6,2,.5);
    color: #FF8E24;
    width: 125px;
    height: 5%;
    font-size: 18px;
    transition: .5s;
    text-align: center;
    border-radius: 10px;
    border: 1px black;
    z-index: 100;
}

#chapter-back {
    background: rgba(12,6,2);
    top: 45%;
    left: 25%;
    width: 250px;
    height: 10%;
    font-size: 36px;
}

#chapter-mobile {
    display: none;
}

.back-mobile, .forward-mobile {
    display: none;
}


@media screen and (max-width: 750px) {
    body {
        overflow: hidden;
        padding: 0;
        height: 94vh;
        display: grid;
        grid-template-columns: 1fr 1.5fr 1fr;
        grid-template-rows: 1fr 50fr;
        grid-row:auto;
        grid-template-areas: 
        "prev chapter next"
        "book book book";

        justify-content: center;
        align-items: center;

        font-family: sans-serif;
        background-color: #AD8365;
    }

    #chapter-mobile {
        display: inherit;
        position: inherit;
        grid-area: chapter;
        width: 100%;
        height: 80%;
        background: rgba(12,6,2,1);
    }

    #chapter-cover, #chapter-back {
        display: none;
    }

    .book {
        grid-area: book;
        position: relative;
        left: 5%;
        width: 90%;
        height:101%;
        transition: transform 0.5s;
    }
    .button {
        margin-top: 15%;
        position: absolute;
    }
    #prev-btn {
        grid-area: prev;
    }
    #next-btn {
        grid-area: next;
    }
    .front > div > img {
        padding:0;
        margin: 0;
        height: 100%;
        width: 100%;
        object-fit: fill;
    }
    .back {
        display: none;
        visibility: hidden;
    }
    .front {
        width: 100%;
    }
    #chapter-header {
        margin-left: 7%;
        margin-top: 18%;
        font-size: 15px;
    }

    #chapter-bar {
        margin-left: 7%;
        margin-bottom: 28%;
        font-size: 15px;
    }
    #indent, #no-indent, #page-end {
        margin-left: 4%;
        margin-right: 2%;
        font-size: 10px;
        line-height: 1.15;
    }
    .back-mobile {
        display: inherit;
        position: absolute;
        width: 50%;
        height: 100%;
        left: 0;
        z-index: 90;
    }
    .forward-mobile {
        display: inherit;
        position: absolute;
        width: 50%;
        height: 100%;
        right:0;
        z-index: 90;
    }
}