html {
	height: 100%;
	width: 100%;
	text-align: center;
    background-color: #ffffef;
}
body {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
}

#back {
	color: #200080;
	text-decoration: none;
	font-family: serif;
}

.link {
    height: min(35vw, 30%);
    font-family: serif;
    font-size: min(12vw, 12vh);
    text-decoration: none;
    color: white;
    display: flex;
    justify-content: center;
}
.book {
    position: relative;
    border: 3px solid black;
    border-radius: 10px;
    width: 95%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.lock {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    height: 75%;
}