style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font: 1rem Arial;
}

/* The Modal (background) */
.modal {
    display: none;
    /* Hidden by default */
    position: fixed;
    /* Stay in place */
    z-index: 1;
    /* Sit on top */
    left: 0;
    top: 0;
    width: 100%;
    /* Full width */
    height: 100%;
    /* Full height */
    overflow: auto;
    /* Enable scroll if needed */
    background-color: rgb(0, 0, 0);
    /* Fallback color */
    background-color: rgba(0, 0, 0, 0.4);
    /* Black w/ opacity */
}

/* Modal Content/Box */
.modal-content {
    background-color: rgb(31, 40, 49);
    padding: 10px 5px;
    border: 1px solid grey;
    border-radius: 3px;
    width: 240px;
    display: flex;
}

.modal-content input {
    outline: none;
    background-color: transparent;
    color: white;
}

/* The Close/save Buttons */
.close,
.save {
    margin-left: 12px;
    font-weight: bold;
}

.close {
    color: red;
    font-size: 30px;
}

.save {
    font-size: 24px;
    color: green;
}

.close:hover,
.close:focus,
.save:hover,
.save:focus {
    color: white;
    text-decoration: none;
    cursor: pointer;
}

/* ----------------------------------- */
#panel {
    position: absolute;
    top: 14%;
    left: 85%;
    z-index: 50;
    width: 120px;
    height: 410px;
}

#panel-header {
    padding: 10px;
    cursor: move;
    z-index: 51;
    height: 40px;
    width: 90px;
    background-color: rgb(23, 29, 49);
    border: 1px solid grey;
    border-radius: 4px;
}

.panel-body {
    width: 120px;
    display: flex;
    z-index: 50;
    -webkit-user-select: none; /* Safari */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* IE10+/Edge */
    user-select: none; /* Standard */
}

.left {
    width: 90px;
    background-color: rgb(23, 29, 49);
    border: 1px solid grey;
    border-radius: 4px;
    z-index: 49;
}

.right {
    display: inline-block;
    width: 30px;
    background-color: rgb(23, 29, 49);
    border: 1px solid grey;
    border-radius: 4px;
    z-index: 48;
    color: rgb(252, 233, 79);
    transition: all 300ms;
    transform: translateX(-30px);
}

.hide {
    transform: translateX(0px);
}

.row {
    display: flex;
    height: 32px;
}

.cmd {
    flex: 1;
    padding: 2px;
    cursor: pointer;
    font-size: 65%;
    text-align: center;
}

.selected {
    background-color: orange;
    color: black;
}

.disabled {
    background-color: darkslategray;
    cursor: not-allowed;
}

.divider {
    border-top: 1px dashed gray;
    padding: 0px 2px;
}

/* 
    ICONS: https://materialdesignicons.com/

    To change the color: 
    https://stackoverflow.com/questions/22252472/how-to-change-the-color-of-an-svg-element
    https://codepen.io/sosuke/pen/Pjoqqp
*/
.icon-white {
    height: 24px;
    width: 24px;
    filter: invert(98%) sepia(42%) saturate(4100%) hue-rotate(183deg) brightness(127%) contrast(81%);
}

ul {
    list-style-type: none;
}

.color-dot {
    border: 1px solid white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    margin: 3px auto;
}

.selected-color {
    border: 4px solid orange;
}

/* Tooltip container */
.tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted black;
    /* If you want dots under the hoverable text */
}

/* Tooltip text */
.tooltip .tooltiptext {
    visibility: hidden;
    width: 60px;
    background-color: darkorange;
    color: #fff;
    text-align: center;
    padding: 5px 0;
    border-radius: 6px;

    /* Position the tooltip text */
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -30px;

    /* Fade in tooltip */
    opacity: 0;
    transition: opacity 0.3s;
}

/* Tooltip arrow */
.tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: darkorange transparent transparent transparent;
}

/* Show the tooltip text when you mouse over the tooltip container */
.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.slidecontainer {
    width: 100%;
    padding: 6px 4px;
}

.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 4px;
    background: #e3e3e3;
    outline: none;
    opacity: 0.6;
    -webkit-transition: 0.2s;
    transition: opacity 0.2s;
}

.slider:hover {
    opacity: 1;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12.5px;
    height: 12.5px;
    border-radius: 50%;
    background: darkorange;
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 12.5px;
    height: 12.5px;
    border-radius: 50%;
    background: darkorange;
    cursor: pointer;
}