@import url('https://fonts.googleapis.com/css?family=Montserrat&display=swap');





* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}







.imagenes {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.galeria {
    font-family: 'open sans';
}

.galeria h1 {
    text-align: center;
    margin: 20px 0 15px 0;
    font-weight: 300;
}

.linea {
    border-top: 5px solid #0077C0;
    margin-bottom: 40px;
}

.contenedor-imagenes {
    display: flex;
    width: 85%;
    margin: auto;
    justify-content: space-around;
    flex-wrap: wrap;
    border-radius: 3px;
}

.contenedor-imagenes .imagen {
    width: 32%;
    position: relative;
    height: 250px;
    margin-bottom: 5px;
    box-shadow: 0px 0px 3px 0px rgba(0, 0, 0, .75)
}

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

.overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    background: rgba(0, 118, 192, 0.781);
    width: 100%;
    height: 0;
    overflow: hidden;
    transition: .5s ease;
}

.overlay h2 {
    color: #fff;
    font-weight: 300;
    font-size: 30px;
    position: absolute;
    top: 50%;
    left: 50%;
    text-align: center;
    transform: translate(-50%, -50%);
}

.imagen:hover .overlay {
    height: 100%;
    cursor: pointer;
}

@media screen and (max-width:1000px) {
    .contenedor-imagenes {
        width: 95%;
    }
}

@media screen and (max-width:700px) {
    .contenedor-imagenes {
        width: 90%;
    }

    .contenedor-imagenes .imagen {
        width: 48%;
    }
}

@media screen and (max-width:450px) {
    h1 {
        font-size: 22px;
    }

    .contenedor-imagenes {
        width: 98%;
    }

    .contenedor-imagenes .imagen {
        width: 80%;
    }
}



/*------------------boton regresar ------------*/