.custom-slider.rzslider .rz-pointer {
    top: -10px;
    width: 26px;
    height: 26px;    
    background-color: #004237;
}

.custom-slider.rzslider .rz-pointer:after {
    position: absolute;
    top: 9px;
    left: 9px;
    width: 8px;
    height: 8px;
}

.custom-slider.rzslider .rz-pointer.rz-active:after {
    background: orange;
}