body {
    background-image: url('../Images/upana-bibliotega-bg.jpg');
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    background-color: white;
}

.shadow_button {
    -moz-transform: translateX(0);
    -webkit-transform: translateX(0);
    -o-transform: translateX(0);
    transform: translateX(0);
}

    .shadow_button:before {
        content: '';
        position: absolute;
        width: 70%;
        left: 5%;
        top: 100%;
        height: 10px;
        background: -moz-radial-gradient(center, ellipse, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0) 80%);
        -moz-transition-duration: 0.3s;
        -webkit-transition-duration: 0.3s;
        -o-transition-duration: 0.3s;
        transition-duration: 0.3s;
        opacity: 0;
    }

    .shadow_button:hover {
        -moz-transform: translateY(-5px);
        -webkit-transform: translateY(-5px);
        -o-transform: translateY(-5px);
        transform: translateY(-5px);
    }

        .shadow_button:hover:before {
            -moz-transform: translateY(5px);
            -o-transform: translateY(5px);
            -webkit-transform: translateY(5px);
            transform: translateY(5px);
            opacity: 1;
        }

.jumbotron {
    opacity: 0.6 !important;
}

img.gray {
    filter: grayscale(100%);
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
    -o-filter: grayscale(100%);
}