Generate the CSS files by rollup as well. Grunt is now obsolete.

dist/uhr-black.min.css

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-.uhr.black{background-color:#111}.black .onoffswitch-inner:before{background-color:#111}.uhr.black .dot:not(.active){border-color:rgba(255,255,255,.1);box-shadow:0 0 .1em rgba(255,255,255,.1)}.uhr.black .letter:not(.active){color:rgba(255,255,255,.1);text-shadow:0 0 .1em rgba(255,255,255,.1)}
+.black .onoffswitch-inner:before,.uhr.black{background-color:#111}.uhr.black .dot:not(.active){border-color:hsla(0,0%,100%,.1);box-shadow:0 0 .1em hsla(0,0%,100%,.1)}.uhr.black .letter:not(.active){color:hsla(0,0%,100%,.1);text-shadow:0 0 .1em hsla(0,0%,100%,.1)}

dist/uhr-blue.min.css

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-.uhr.blue{background-color:#00a}.blue .onoffswitch-inner:before{background-color:#00a}.uhr.blue .dot:not(.active){border-color:rgba(255,255,255,.1);box-shadow:0 0 .1em rgba(255,255,255,.1)}.uhr.blue .letter:not(.active){color:rgba(255,255,255,.1);text-shadow:0 0 .1em rgba(255,255,255,.1)}
+.blue .onoffswitch-inner:before,.uhr.blue{background-color:#00a}.uhr.blue .dot:not(.active){border-color:hsla(0,0%,100%,.1);box-shadow:0 0 .1em hsla(0,0%,100%,.1)}.uhr.blue .letter:not(.active){color:hsla(0,0%,100%,.1);text-shadow:0 0 .1em hsla(0,0%,100%,.1)}

dist/uhr-green.min.css

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-.uhr.green{background-color:#0c0}.green .onoffswitch-inner:before{background-color:#0c0}.uhr.green .dot:not(.active){border-color:rgba(0,0,0,.1);box-shadow:0 0 .1em rgba(0,0,0,.1)}.uhr.green .letter:not(.active){color:rgba(0,0,0,.1);text-shadow:0 0 .1em rgba(0,0,0,.1)}
+.green .onoffswitch-inner:before,.uhr.green{background-color:#0c0}.uhr.green .dot:not(.active){border-color:rgba(0,0,0,.1);box-shadow:0 0 .1em rgba(0,0,0,.1)}.uhr.green .letter:not(.active){color:rgba(0,0,0,.1);text-shadow:0 0 .1em rgba(0,0,0,.1)}

dist/uhr-pink.min.css

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-.uhr.pink{background-color:#f0a}.uhr.pink .dot.active{border-color:#fff;box-shadow:0 0 .1em #fff}.uhr.pink .letter.active{color:#fff;text-shadow:0 0 .1em #fff}.pink .onoffswitch-inner:before{background-color:#f0a}.uhr.pink .dot:not(.active){border-color:rgba(255,255,255,.1);box-shadow:0 0 .1em rgba(255,255,255,.1)}.uhr.pink .letter:not(.active){color:rgba(255,255,255,.1);text-shadow:0 0 .1em rgba(255,255,255,.1)}
+.uhr.pink{background-color:#f0a}.uhr.pink .dot.active{border-color:#fff;box-shadow:0 0 .1em #fff}.uhr.pink .letter.active{color:#fff;text-shadow:0 0 .1em #fff}.pink .onoffswitch-inner:before{background-color:#f0a}.uhr.pink .dot:not(.active){border-color:hsla(0,0%,100%,.1);box-shadow:0 0 .1em hsla(0,0%,100%,.1)}.uhr.pink .letter:not(.active){color:hsla(0,0%,100%,.1);text-shadow:0 0 .1em hsla(0,0%,100%,.1)}

dist/uhr-red.min.css

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-.uhr.red{background-color:#700}.red .onoffswitch-inner:before{background-color:#700}.uhr.red .dot:not(.active){border-color:rgba(255,255,255,.1);box-shadow:0 0 .1em rgba(255,255,255,.1)}.uhr.red .letter:not(.active){color:rgba(255,255,255,.1);text-shadow:0 0 .1em rgba(255,255,255,.1)}
+.red .onoffswitch-inner:before,.uhr.red{background-color:#700}.uhr.red .dot:not(.active){border-color:hsla(0,0%,100%,.1);box-shadow:0 0 .1em hsla(0,0%,100%,.1)}.uhr.red .letter:not(.active){color:hsla(0,0%,100%,.1);text-shadow:0 0 .1em hsla(0,0%,100%,.1)}

dist/uhr.min.css

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-@font-face{font-family:Uhrenfont;src:url(../resources/uhr.woff) format('woff')}body{font-family:Uhrenfont,sans-serif}.uhr{position:relative;margin:0;transition:background-color .5s}.uhr .reflection{position:absolute;top:0;bottom:0;left:0;right:0;background:radial-gradient(225em 45em at 160% 0,rgba(255,255,255,.4) 0,rgba(255,255,255,.05) 40%,rgba(255,255,255,0) 40%) no-repeat scroll;display:block;margin:.15em}.uhr .letterarea{display:block;position:absolute;top:12%;bottom:12%;left:12%;right:12%;overflow:hidden;font-size:200%}.item{transition:box-shadow .5s,text-shadow .5s,border-color .5s,color .5s}.dot{position:absolute;display:block;height:0;width:0;border:.2em solid;border-radius:1em}.dot.active{border-color:#eee;box-shadow:0 0 .2em #eee}.dot1{top:3.75%;left:3.75%}.dot2{top:3.75%;right:3.75%}.dot3{bottom:3.75%;right:3.75%}.dot4{bottom:3.75%;left:3.75%}.letter{height:10%;width:9.0909%;padding:0;margin:0;display:inline-block;text-align:center;line-height:160%}.letter.active{color:#eee;text-shadow:0 0 .2em #eee}.onoffswitch{position:relative;width:86px;margin:1em;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.onoffswitch-checkbox{display:none}.onoffswitch-label{display:block;overflow:hidden;cursor:pointer;border:2px solid #999;border-radius:50px}.modeswitch-inner,.onoffswitch-inner{width:200%;margin-left:-100%;-moz-transition:margin .3s ease-in 0s;-webkit-transition:margin .3s ease-in 0s;-o-transition:margin .3s ease-in 0s;transition:margin .3s ease-in 0s}.modeswitch-inner:after,.modeswitch-inner:before,.onoffswitch-inner:after,.onoffswitch-inner:before{float:left;width:50%;height:24px;padding:0;line-height:24px;font-size:18px;color:#fff;font-weight:700;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}.onoffswitch-inner:before{content:"EIN";padding-left:12px;color:#eee;transition:background-color .5s}.onoffswitch-inner:after{content:"AUS";padding-right:12px;background-color:#eee;color:#999;text-align:right}.onoffswitch-switch{width:30px;margin:-3px;background:#fff;border:2px solid #999;border-radius:50px;position:absolute;top:0;bottom:0;right:58px;-moz-transition:all .3s ease-in 0s;-webkit-transition:all .3s ease-in 0s;-o-transition:all .3s ease-in 0s;transition:all .3s ease-in 0s}.onoffswitch-checkbox:checked+.onoffswitch-label .modeswitch-inner,.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-inner{margin-left:0}.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-switch{right:0}.modeswitch-inner:before{content:"MIN";padding-left:12px;background-color:#fff;color:#000}.modeswitch-inner:after{content:"SEC";padding-right:12px;background-color:#fff;color:#000;text-align:right}a.uhr-configlink{cursor:pointer;background:url(../resources/settings.png) no-repeat;width:24px;height:24px;display:inline-block;margin:2px;vertical-align:top}.uhr-controlpanel{border-radius:.5em;box-shadow:0 0 1em #000;background-color:#fff;display:inline-block;padding:.5em;position:sticky;bottom:0;margin-left:1em}.uhr-controlpanel .content{position:relative}a.uhr-closecontrolpanel{cursor:pointer;display:inline-block;position:absolute;right:0;top:-1em;width:24px;height:24px;background:url(../resources/close.png) no-repeat}#disclaimer{font-size:.5em}#disclaimer a{color:#444;text-decoration:underline}
+@font-face{font-family:Uhrenfont;src:url(../resources/uhr.woff) format("woff")}body{font-family:Uhrenfont,sans-serif}.uhr{position:relative;margin:0;transition:background-color .5s}.uhr .reflection{position:absolute;top:0;bottom:0;left:0;right:0;background:radial-gradient(225em 45em at 160% 0,hsla(0,0%,100%,.4) 0,hsla(0,0%,100%,.05) 40%,hsla(0,0%,100%,0) 0) no-repeat scroll;display:block;margin:.15em}.uhr .letterarea{display:block;position:absolute;top:12%;bottom:12%;left:12%;right:12%;overflow:hidden;font-size:200%}.item{transition:box-shadow .5s,text-shadow .5s,border-color .5s,color .5s}.dot{position:absolute;display:block;height:0;width:0;border:.2em solid;border-radius:1em}.dot.active{border-color:#eee;box-shadow:0 0 .2em #eee}.dot1{top:3.75%;left:3.75%}.dot2{top:3.75%;right:3.75%}.dot3{right:3.75%}.dot3,.dot4{bottom:3.75%}.dot4{left:3.75%}.letter{height:10%;width:9.0909%;padding:0;margin:0;display:inline-block;text-align:center;line-height:160%}.letter.active{color:#eee;text-shadow:0 0 .2em #eee}.onoffswitch{position:relative;width:86px;margin:1em;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.onoffswitch-checkbox{display:none}.onoffswitch-label{display:block;overflow:hidden;cursor:pointer;border:2px solid #999;border-radius:50px}.modeswitch-inner,.onoffswitch-inner{width:200%;margin-left:-100%;-moz-transition:margin .3s ease-in 0s;-webkit-transition:margin .3s ease-in 0s;-o-transition:margin .3s ease-in 0s;transition:margin .3s ease-in 0s}.modeswitch-inner:after,.modeswitch-inner:before,.onoffswitch-inner:after,.onoffswitch-inner:before{float:left;width:50%;height:24px;padding:0;line-height:24px;font-size:18px;color:#fff;font-weight:700;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}.onoffswitch-inner:before{content:"EIN";padding-left:12px;color:#eee;transition:background-color .5s}.onoffswitch-inner:after{content:"AUS";padding-right:12px;background-color:#eee;color:#999;text-align:right}.onoffswitch-switch{width:30px;margin:-3px;background:#fff;border:2px solid #999;border-radius:50px;position:absolute;top:0;bottom:0;right:58px;-moz-transition:all .3s ease-in 0s;-webkit-transition:all .3s ease-in 0s;-o-transition:all .3s ease-in 0s;transition:all .3s ease-in 0s}.onoffswitch-checkbox:checked+.onoffswitch-label .modeswitch-inner,.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-inner{margin-left:0}.onoffswitch-checkbox:checked+.onoffswitch-label .onoffswitch-switch{right:0}.modeswitch-inner:before{content:"MIN";padding-left:12px;background-color:#fff;color:#000}.modeswitch-inner:after{content:"SEC";padding-right:12px;background-color:#fff;color:#000;text-align:right}a.uhr-configlink{cursor:pointer;background:url(../resources/settings.png) no-repeat;width:24px;height:24px;display:inline-block;margin:2px;vertical-align:top}.uhr-controlpanel{border-radius:.5em;box-shadow:0 0 1em #000;background-color:#fff;display:inline-block;padding:.5em;position:sticky;bottom:0;margin-left:1em}.uhr-controlpanel .content{position:relative}a.uhr-closecontrolpanel{cursor:pointer;display:inline-block;position:absolute;right:0;top:-1em;width:24px;height:24px;background:url(../resources/close.png) no-repeat}#disclaimer{font-size:.5em}#disclaimer a{color:#444;text-decoration:underline}