#container{--current-color: rgb(255, 255, 255);--current-hue-color: rgb(255, 0, 0);--current-hue: 0}#container #color-area{background-color:var(--current-hue-color);background-image:linear-gradient(to top,#000,#0000),linear-gradient(to right,#fff,#fff0)}#container #hue-slider{background:linear-gradient(to right,red,#ff0,#0f0,#0ff,#00f,#f0f,red)}