gradient-bg($custom-range-thumb-active-bg);\n    }\n  }\n\n  &::-webkit-slider-runnable-track {\n    width: $custom-range-track-width;\n    height: $custom-range-track-height;\n    color: transparent; // Why?\n    cursor: $custom-range-track-cursor;\n    background-color: $custom-range-track-bg;\n    border-color: transparent;\n    @include border-radius($custom-range-track-border-radius);\n    @include box-shadow($custom-range-track-box-shadow);\n  }\n\n  &::-moz-range-thumb {\n    width: $custom-range-thumb-width;\n...