Basic css switches (I just needed a checkbox, you might too).

index.styl

switchHeight  = 15px
switchPadding = 2px
switchWidth   = 25px
.switch
    position absolute
    height switchHeight
    width switchWidth
    top 4px
    right 5px
    border-top-left-radius 25% 50%
    border-top-right-radius 25% 50%
    border-bottom-right-radius 25% 50%
    border-bottom-left-radius 25% 50%
    background red
    &:before
        content ''
        position absolute
        height switchHeight - switchPadding * 2
        width @height
        top switchPadding
        left switchPadding
        border-radius 50%
        background yellow
        transition .2s
    &.off
        &:before
            left switchWidth - switchHeight + switchPadding