* {
    margin: 0;
    padding: 0;
    font-family: 'PT Sans', sans-serif;
}

body {
    display:grid;
    grid-template-columns: auto auto auto;
    grid-gap: 10px;
    align-content: center;
    margin-left: 173px;/*No sé como alinearlos al centro*/
    min-height: 100vh;
    background: linear-gradient(#007bb2,#0d1423);
    /*por qué si pongo background color, no sale nada?*/

}

.tarjeta {
    position: relative;
    width: 320px;
    height: 450px;
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    box-shadow:5px 5px 3px 2px black;

}

.tarjeta .poster {
    position: relative;
    overflow: hidden;

}

.tarjeta .poster::before {
    content: '';
    position: absolute;
    bottom: -180px;
    width: 100%;
    height: 100%;
    background: linear-gradient(0deg, #1064a6 50%, transparent);
transition: 0.5s;
    z-index: 1;
}

.tarjeta:hover .poster img {
    bottom: 0px;
}

.tarjeta .poster img{
    width: 100%;

    transition: 0.5s;
}
.tarjeta:hover .poster img{
    
    transform: translateY(-50px);
    filter: blur(5px);
}
.tarjeta .detalles{
    position: absolute;
    bottom: 0;
    left: 0;
    padding: 20px;
    transition: 0.5s;
    width: 100%;
    z-index: 2;
}
.tarjeta:hover .detalles{
    bottom: 40px;
}

.tarjeta .detalles p{
    
    font-size: 0.8em;
    color: white;
    
}
.tarjeta .detalles span{
    
    font-size: 0.8em;
    color: yellow;
}