index.css

:root {
    --mainWidth: 0%;
    --bgColor: hsl(260deg, 84%, 11%);
    --bgOutline: hsl(260deg, 84%, 20%);
    --hamburgerHideControlsMargin: .6rem;
    --txtColor: hsl(230deg, 40%, 86%);
    --standardTransition: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --minimumDistanceFromMain: calc(1.5 * var(--hamburgerHideControlsMargin));
}

body {
    background-color: var(--bgColor);
    margin: 0;
    display: flex;
    width: 100vw;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    overflow-x: hidden;
}

#canvasContainer {
    width: calc(100% - var(--mainWidth));
    height: 100vh;
    margin: 0;
    padding: 0;
    border: 0;
    position: relative;
    /* overflow-x: hidden; */
    z-index: 5;
    cursor: url("cursors/default_no_outline.cur"), default;
}

#canvasContainer canvas {
    position: absolute;
}

#squareInfo {
    position: absolute;
    background-color: var(--bgColor);
    padding: .4rem;
    padding-right: 1rem;
    border-radius: .6rem;
    color: var(--txtColor);
    z-index: 16;
    
    -moz-user-select: -moz-none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    -o-user-select: none;
    user-select: none;

    --timeTaken: .1s;
    transition: opacity var(--standardTransition) var(--timeTaken), visibility var(--standardTransition) var(--timeTaken);
}

.canPlace {
    cursor: url("cursors/addbox_no_outline.cur"), copy !important;
}

.canDelete {
    cursor: url("cursors/removebox2_no_outline.cur"), copy !important;
}

.canGrab {
    cursor: grab !important;
}

.isGrabbing {
    cursor: grabbing !important;
}

#canvasControls {

    --leftCorner: 0vw;

    position: absolute;
    box-sizing: border-box;
    display: flex;
    justify-content: flex-start;
    align-items: flex-end;
    bottom: 0%; /* Was 1% */
    left: var(--leftCorner);
    width: 100%;
    height: 15vw;
    max-height: 15vh;
    max-width: calc(100% - var(--minimumDistanceFromMain) - var(--leftCorner));
    /* overflow: hidden; */
}

#canvasControls button, #hideMain {

    --borderThickness: .33rem;
    --cornerRadius: 0 1rem 0rem 0;
    
    position: relative;
    border: var(--bgOutline) solid var(--borderThickness);
    cursor: pointer;
    background-color: var(--bgColor);

    transition: height var(--standardTransition) .15s;
    overflow-y: hidden;
}

#canvasControls button {
    width: 7vw;
    height: 60%;
    margin: 0 .14vw;
}

#canvasControls button img {
    height: 75%;
    width: auto;
    max-width: 100%;
    max-height: fit-content;
    margin: auto;
    
    transform: rotate(-8deg);
    transition: height var(--standardTransition) .1s, transform var(--standardTransition) .1s;
}

#canvasControls > button:last-child {
    margin-right: 0;
    border-radius: var(--cornerRadius);
}

#canvasControls > button:first-child {
    margin-left: 0;
    width: 12vw !important;
    height: 80%;
    border-radius: var(--cornerRadius);
}

#canvasControls button[data-hotkey]::after {
    content: 'hotkey: ' attr(data-hotkey);
    position: absolute;
    bottom: 100%;
    right: 0;
    background-color: var(--bgColor);
    border: calc(var(--borderThickness) * 2 / 3) solid var(--bgOutline);
    padding: .4rem;
    padding-right: 1rem;
    border-radius: .6rem;
    color: var(--txtColor);
    z-index: 99;
    visibility: hidden;
}

#canvasControls button:hover {
    height: 100%;
}

#canvasControls button[data-hotkey]:hover::after {
    visibility: visible;
}

#canvasControls button:hover img {
    height: 80%;
    transform: rotate(360deg);
}

/* #canvasControls button:active {
    height: 95%;
} */

#canvasControls button:active img {
    transition: height var(--standardTransition) 50ms, transform var(--standardTransition) 50ms;

    height: 65%;
    transform: rotate(355deg);
}

#canvasControls button.active {
    background-color: green;
}

#canvasContainer #canvasContainerCanvasses {
    width: 100%;
    height: 100vh;
    margin: 0;
    padding: 0;
    border: 0;
    position: relative;
    /* overflow-x: hidden; */
    z-index: 5;
}

#playpause img {
    display: none;
}

#playpause.active {
    background-color: rgb(152, 5, 5) !important;
}

#playpause.active img[alt='Pause'] {
    display: inherit !important;
}

#playpause:not(.active) {
    background-color: rgb(5, 152, 5) !important;
}

#playpause:not(.active) img[alt='Play'] {
    display: inherit !important;
}

#reset:active {
    background-color: rgb(36, 105, 117);
}

input[type='number'] {
    color: var(--txtColor);
    /* background-color: #00000000; */
    outline: none;
    border: none;
    -webkit-appearance: none;
}

main {
    width: var(--mainWidth);
    background-color: var(--bgColor);
    color: var(--txtColor);
}

main .border {
    border-left: solid .5vw var(--bgOutline);
    box-sizing: border-box;
    min-height: 100vh;
}

.mainContent {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: initial;
    white-space: nowrap;
}

main nav {
    background-color: hsl(260deg, 84%, 40%);
    width: 100%;
    padding: .4rem;
}

main, #canvasContainer, #canvasContainerCanvasses {
    transition: width var(--standardTransition) .3s;
}

main.dragging, #canvasContainer.dragging {
    transition: width 0s linear;
}

#hideMain {
    position: absolute;
    top: 0;
    right: 0;
    padding: .6rem .3rem;
    margin: var(--hamburgerHideControlsMargin);
    margin-right: var(--minimumDistanceFromMain);

}

#hideMain img {
    transition: transform var(--standardTransition) .1s;
}

#hideMain:active img {
    transform: rotate(-10deg);
}

#dragMainBox {
    position: absolute;
    top: 0;
    right: calc(0rem - var(--hamburgerHideControlsMargin));
    /* background-color: red; */
    box-sizing: border-box;
    border: none;
    width: calc(2 * var(--hamburgerHideControlsMargin));
    height: inherit;
    cursor: e-resize;

    transition: border var(--standardTransition) .1s;
}

#dragMainBox:hover {
    border-right: 1px solid cyan;
    border-left: 1px solid cyan;
}

.controls {
    background-color: hsl(260deg, 84%, 30%);
    padding: 1rem .8rem 1rem .8rem;
    margin: 1rem 0;
    overflow-x: hidden;
}

.controls > * {
    display: block;
    margin-bottom: .8rem;
}

.controls > *:last-child {
    margin-bottom: 0;
}

.listChoice {
    overflow-x: auto; /* Gives a horizontal scrollbar but only when necessary */
    white-space: nowrap;
}

.listChoice * {
    display: inline-block;
}

.listChoice button, .buttonStyle {
    border: none;
    background-color: hsl(260deg, 84%, 40%);
    cursor: pointer;
    color: var(--txtColor);
    padding: .8em;
    margin: .3em;
}

.listChoice button.active {
    background-color: var(--bgOutline);
    cursor: not-allowed;

}

.listChoice button:not(.active):hover {
    background-color: hsl(260deg, 84%, 50%);                
}

.listChoice button:not(.active):active, .buttonStyle:active {
    background-color: hsl(260deg, 95%, 30%);                
}

.listChoice button:first-child, .buttonStyle:first-child {
    margin-left: 0;
}

.listChoice button:last-child, .buttonStyle:last-child {
    margin-right: 0;
}

#currentPlaceColor {
    background-color: var(--bgColor);
    padding: .5em;
    border: none;
    cursor: pointer;
}

#currentPlaceColor:hover {
    background-color: var(--txtColor);
}