source: public/assets/plugins/colorpickle/plugin-theme.css

.colorpickle-theme-engineer {
        background-color: #535353;
    color: #e1e1e1;
        border: 1px solid #333;
        border-radius: 3px;
}

.colorpickle-theme-engineer input[type="text"] {
        color: #e1e1e1;
        background-color: transparent;
        border: none;
}

.colorpickle-theme-engineer button {
        background-color: #5f5f5f;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    color: #e1e1e1;
    box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.2) inset;
    border: 1px solid rgba(0, 0, 0, 0.5);
    border-radius: 3px;
}

.colorpickle-theme-engineer button:hover {
        background-color: #787878;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
}

.colorpickle-theme-engineer .sliderBg {
        border: 1px solid #333;
}

.colorpickle-theme-engineer .colorPickerWrapper {
        border: 1px solid #333;
}

.colorpickle-theme-engineer .swatch {
        border: 1px solid #333;
}

.colorpickle-theme-engineer input[type=range]::-webkit-slider-thumb {
        height: 32px;
        width: 11px;
        margin-top: -7px;
        background-image: url('images/slider-thumb-engineer.png');
}

.colorpickle-theme-engineer input[type=range]::-moz-range-thumb {
        height: 33px;
        width: 11px;
        background-image: url('images/slider-thumb-engineer.png');
}

.colorpickle-theme-engineer input[type=range]::-ms-thumb {
        height: 32px;
        width: 11px;
        margin-top: -39px;
        background-image: url('images/slider-thumb-engineer.png');
}