.demo-wrap {
    position: relative;
}

.demo-wrap:before {
    content: ' ';
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    opacity: 0.4;
    background-image: url('../assets/img/background/jail.webp');
    background-repeat: no-repeat;
    background-position: 50% 0;
    background-size: cover;
}

.demo-content {
    position: relative;
}