body,
ol,
ul,
h1,
h2,
h3,
h4,
h5,
h6,
p,
th,
td,
dl,
dd,
form,
fieldset,
legend,
input,
textarea,
i,
select {
    margin: 0;
    padding: 0;
}



.container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 100vw;
}

.Libro-out {
    z-index: -99;
    width: 720px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: absolute;
    top: 140px;
}

.Libro-inner {
    z-index: 99;
    width: 900px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: absolute;
    top: 33%;
    right: 60%;
    overflow: hidden;
    background-color: transparent;

}

.Libro {
    width: 180px;
    height: 255px;
    background-color: rgb(12, 33, 223);
    transition: all .3s ease-in-out;
    transform-origin: left center 0px;
    transform-style: preserve-3d;
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
    -webkit-backface-visibility: hidden;
    overflow: hidden;
}

.Libro-out .Libro::after {
    content: " ";
    display: block;
    opacity: 0;
    width: 180px;
    height: 255px;
    position: relative;
    left: 8px;
    transition: all .3s ease;
}

.Libro-out .Libro::before {
    content: " ";
    z-index: 999;
    display: block;
    width: 20px;
    height: 100px;
    opacity: 0;
    position: absolute;
    top: -12px;
    right: 8px;
    transition: all .25s;
    background: url('data:image/png;base64,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');
    background-size: 16px;
    background-repeat: no-repeat;
}

/*------ background-pic ------*/

.Libro-1 {
    background: url('FISICA.png');
    background-size: 180px 255px;
}

.Libro-2 {
    background: url('MATEMATICAS.jpg');
    background-size: 180px 255px;
}

.Libro-3 {
    background: url('QUIMICA.png');
    background-size: 180px 255px;
}



.Libro-inner .Libro {
    margin-left: 90px;
    position: relative;
    margin: 20px;
}

/* ----- hover ----- */

.Libro:hover {
    cursor: pointer;
    transform: rotateY(-28deg) rotateZ(-2deg) scale(1.02);
    -webkit-backface-visibility: hidden;
    box-shadow: 1px 3px 2px #cdd1f3, 20px 8px 0 #ffffff;
}

.Libro:hover::after {
    content: " ";
    display: block;
    opacity: 1;
    width: 172px;
    height: 255px;
    position: relative;
    left: 8px;
    background: linear-gradient(-180deg, rgba(255, 255, 255, 0.486) 0%, rgba(255, 255, 255, 0) 60%);
}

.Libro:hover::before {
    transform: translateY(9px);
    opacity: 1;

}