* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    position: relative;
    border: none;
    outline: none;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

body {
    counter-reset: section;
}

@page {
    size: 8.5in 11in;
}

section {
    aspect-ratio: 8.5/11;
    padding: 6vw;
}

section::before {
    counter-increment: section;
    content: "Page " counter(section);
    position: absolute;
    top: calc(100% - 6vw);
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    font-size: 2vw;
}

h1 {
    font-size: 6vw;
}

h2 {
    font-size: 5vw;
}

h3 {
    font-size: 4vw;
}

h4 {
    font-size: 3vw;
}

h5 {
    font-size: 2.5vw;
}

h6 {
    font-size: 2vw;
}

p {
    font-size: 3vw;
}

ul,
ol {
    margin-left: 6vw;
}

li {
    font-size: 3vw;
}

a {
    font-size: 3vw;
}

img {
    width: 80%;
    display: block;
    margin: 1vw auto;
}

.content-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.content-row.sub {
    padding-left: 4vw;
}

.vertical-margin-4 {
    margin-top: 8vw;
}

.vertical-margin-2 {
    margin-top: 4vw;
}

.vertical-margin-1 {
    margin-top: 2vw;
}

section>*:first-child {
    margin-top: 0;
}

.align-left {
    text-align: left;
}

.align-center {
    text-align: center;
}

.align-right {
    text-align: right;
}

.bold {
    font-weight: bold;
}

.italic {
    font-style: italic;
}

.rtl {
    direction: rtl;
}

.ltr {
    direction: ltr;
}

.saber-print-floating-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    -o-border-radius: 50%;
    background-color: #28a745;
    color: #fbfbfb;
    position: fixed;
    bottom: 12px;
    right: 12px;
    cursor: pointer;
    transition-duration: 0.1s;
}

.saber-print-floating-btn:hover {
    opacity: 0.8;
}

.saber-print-floating-btn svg {
    width: 30px;
}

@media print {
    .saber-print-floating-btn {
        display: none;
    }
}

.book-cover {
    padding: 0;
}

.cover-img {
    height: 100%;
    width: 100%;
}