@mixin pseudo-element {
    background-size: cover;
    background-position: left top;
    background-repeat: no-repeat;
    background-attachment: fixed;
    position: relative;

    &:before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        background: rgba($black, .4);
        z-index: 1;
    }
}