style.css

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-color: #263238;
    color: gainsboro;
}

div.main {
    position: relative;
    height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
}

.title {
    width: 100%;
    height: 100%;
    display: grid;
    place-content: center;
    font-family: 'Alegreya Sans';
    font-size: 1.5rem;
    letter-spacing: .03em;
}

h1 {

    max-width: 300px;
    text-align: center;
    text-shadow: 0 0 10px whitesmoke;
    margin: 0 auto;
    color: #333;

}

.title div.subtitle {
    width: 95vw;
    max-width: 400px;
    text-align: center;
    font-size: .9rem;
    margin: 1rem auto;
    background-color: whitesmoke;
    color: #333;
    padding: .5em;
    border-radius: .5em;
    font-weight: 300;
}

.title a {
    color: gray;
}


.author {
    font-size: .9rem;
    text-align: center;
}


.opening {
    filter: blur(4px);
}

.canvas-container,
.svg-container,
.text-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.canvas-container,
.svg-container {
    /*height: 80vh;*/
}

svg {
    display: block;
}

.wrapper {
    position: relative;
    flex-basis: 100%;
    /*height: 70vh;*/
}

.wrapper .dialog-new-point {
    position: absolute;
    right: 0;
    top: 0;
    transform: translate(-1em, 1em);
    transition: transform .4s;
    width: 150px;
    font-size: .6rem;
    font-family: 'Fira Code';
    font-weight: lighter;
    text-align: center;
    background-color: blanchedalmond;
    color: #263238;
    padding: .5em;
    border-radius: .5em;

}

.yes-no-mode {
    display: none;
}

.dialog-new-point.yes-no .passive {
    display: none;
}

.dialog-new-point.yes-no .yes-no-mode {
    display: block;
}

.yes-no-buttons {
    display: flex;
    gap: 10px;
}

.yes-no-buttons button {
    flex-basis: 50%;
    background-color: transparent;
    border: 1px solid currentColor;
    border-radius: 5px;
    font-family: inherit;
    font-size: inherit;
}

.yes-no-buttons button:hover {
    background-color: #FFFFFF90; 
}
.yes-no-buttons button:active {
    transform: translate(1px, 1px);
}

/* CONTROLS, UI */

.controls {
    /*height: 30vh;*/
    border: 1px solid white;
    color: ghostwhite;
    padding: 1em;
    padding-top: 2rem;
    font-family: 'Fira Code';
    font-size: .8rem; 
}

.controls p {
      
}

.controls label {
    font-weight: 300;
}

/* Button play and slider */

.controls .play-pause {

    display: flex;
    flex-direction: row;
    align-items: center;
    margin-bottom: 1em;
    height: 3rem;

}

.controls .btn-play {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 2rem;
    height: 2rem;
    font-size: 1.5rem;
    line-height: 1.5rem;
    color: #333;
    margin-right: 1em;
}

.controls .btn-play[data-mode="paused"]::before { content: "\23F5"; }
.controls .btn-play[data-mode="playing"]::before { content: "\23F8"; }

.slider-wrapper {
    position: relative;
    width: 200px;
    display: flex;
    flex-direction: row;
    align-items: center;
    height: 100%;
}

.slider-wrapper input[type="range"] {
    width: 100%;
    height: 100%;
}

.slider-wrapper span.label {
    position: absolute;
    font-size: .8em;
    font-weight: 300;
    top: 0;
    left: 0%;
    transform: translateX(-50%);
}

.controls datalist option {
    color: ghostwhite;
}

/* checkboxes */
.container-checkbox {
    margin-top: 1em;
    display: flex;
    align-items: center;
    font-size: .9em;
}

input[type="checkbox"] {
    margin-right: .5em;
}

/* select, fade */
select#ctrl-past-segments-fade {
    background-color: transparent;
    color: inherit;
    font-size: inherit;
    font-family: inherit;
    font-weight: inherit;
    border: 2px solid currentColor;
    border-radius: .5em;
}



/* OPENING */

.canvas-container-opening {

    width: 100%;
    height: 100vh;

}

.initial-point {
    fill: white;
}

.control-polygon {
    stroke: white;
}

.draggable {
    cursor: move;
}

.draggable:hover {
    stroke: lightskyblue;
    stroke-width: 3;

}

.dragging {
    fill: transparent;
    stroke-width: 3;
    stroke: lightskyblue;
    stroke-dasharray: 1;
}

circle {
    transition: fill .4s, stroke .4s;
}

.tentative-point {
    fill: transparent;
    stroke-width: 3;
    stroke: lightskyblue;
    stroke-dasharray: 1;
    
}