.ps__rail-x {
    opacity: 1;
    height: 4px;
    /* there must be 'bottom' or 'top' for ps__rail-x */
    bottom: 0px;
}

.ps__rail-y {
    opacity: 1;
    width: 4px;
    /* there must be 'right' or 'left' for ps__rail-y */
    right: 0;
}

.ps__thumb-x {
    background-color: $light-gray;
    border-radius: 0px;
    height: 4px;
    /* there must be 'bottom' for ps__thumb-x */
    bottom: 0px;
}

.ps__thumb-y {
    background-color: $light-gray;
    border-radius: 0px;
    width: 4px;
    /* there must be 'right' for ps__thumb-y */
    right: 0px;
}

.ps:hover > .ps__rail-x,
.ps:hover > .ps__rail-y,
.ps--focus > .ps__rail-x,
.ps--focus > .ps__rail-y,
.ps--scrolling-x > .ps__rail-x,
.ps--scrolling-y > .ps__rail-y {
    opacity: 1;
    background-color: transparent;
}

.ps .ps__rail-x:hover,
.ps .ps__rail-y:hover,
.ps .ps__rail-x:focus,
.ps .ps__rail-y:focus,
.ps .ps__rail-x.ps--clicking,
.ps .ps__rail-y.ps--clicking {
    opacity: 1;
    background-color: transparent;
}

.ps__rail-x:hover > .ps__thumb-x,
.ps__rail-x:focus > .ps__thumb-x,
.ps__rail-x.ps--clicking .ps__thumb-x {
    background-color: $light-gray;
    height: 4px;
}

.ps__rail-y:hover > .ps__thumb-y,
.ps__rail-y:focus > .ps__thumb-y,
.ps__rail-y.ps--clicking .ps__thumb-y {
    background-color: $light-gray;
    width: 4px;
}