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.parallax-bg {
    background: linear-gradient(rgba(255,255,255,0.85), rgba(255,255,255,1)), url(../images/bg-img.jpg) no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -ms-background-size: cover;
    background-size: cover;
}
.transition {
    -webkit-transition: all 100ms ease-in-out;
    -moz-transition: all 100ms ease-in-out;
    -ms-transition: all 100ms ease-in-out;
    transition: all 100ms ease-in-out;
}