style.css

body {
    margin: 0px;
    padding: 0px;
    overflow: hidden;
    font-family: Arial, Helvetica, sans-serif;
}

canvas {
    position: absolute;
    left: 0%;
    top: 0%;

    z-index: 0;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

/* ---------------------------------------- */

panel {
    position: absolute;

    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: top;

    height: 60%;
    max-width: 500px;
    width: 30%;

    border: 2px solid black;
    border-radius: 24px;

    background-color: whitesmoke;

    z-index: 1;
}

panel_title {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;

    height: 10%;
}

panel_box {
    display: flex;
    align-items: center;
    justify-content: center;

    border-top: 2px solid black;
    width: 95%;
}

panel_multi_box {
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;

    border-top: 2px solid black;

    width: 95%;
    height: 20%;

    flex-direction: column;
    justify-content: space-evenly;
}

panel_box_sub_line {
    display: flex;
    align-items: center;
    justify-content: center;

    max-height: 20%;
    width: 100%;
}

.small_sub_line {
    height: 15%;
    width: 100%;
}

.panel_label {
    width: 80%;
}

.panel_input_box {
    width: 20%;
    text-align: right;
}

.panel_input_pos {
    width: 8%;
    margin-left: 1%;
    text-align: center;
}
.panel_input_small {
    width: 8%;
    text-align: center;
}

.panel_button {
    width: 10%;
}

.progress_bar_box {
    position: absolute;

    top: 8px;
    right: 8px;

    z-index: 2;
}