.jarallax {
    position: relative;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: 50% 50%;
}


/* hero block */
.demo-table {
    display: table;
    width: 100%;
    height: 600px;
    background-color: rgba(39,35,51,0.8);
}
.demo-table-cell {
    display: table-cell;
    text-align: center;
    vertical-align: middle;
}

/* gap */
.demo-gap {
    padding: 50px;
    background-color: #272333;
    text-align: center;
}

/* full height demo */
html.demo-full-height,
html.demo-full-height body,
html.demo-full-height .jarallax,
html.demo-full-height .demo-table {
    height: 100%;
}
html.demo-full-height .jarallax,
html.demo-full-height .demo-table {
    min-height: 900px;
}