body {
    margin: 0;
    overflow: hidden;
    background-color: #ffffff;
    font-size: 16px;
}

:root {
    --font-sans:    "Helvetica Neue", Helvetica, Arial, sans-serif;  
    --text:      #393939;
    --bg:        #ffffff;
    }

canvas {
    display: block;
}

.buttons-array {
    position: fixed;
    top: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    padding: 8px;
}

.button {
    font-family: var(--font-sans);
    font-size: inherit;
    font-weight: 400;
    color: var(--text);
    background: #fafafa;
    border: 1px solid #111;
    border-bottom: none;
    border-radius: 4px;
    padding: 5px 14px 9px;
    opacity: 90%;
    box-shadow: 0 4px 0 #333, 0 5px 0 #111;
    cursor: pointer;
    position: relative;
    transition: box-shadow 0.06s, top 0.06s;
  }
  
.button:active {
    box-shadow: 0 1px 0 #111;
    top: 4px;
  }
  
.button:hover {
    background: #f0f0f0;
  }

.toggle-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 2px;
    font-family: var(--font-sans);
    font-size: inherit;
    color: var(--text);
    user-select: none;
}

.switch {
    position: relative;
    width: 36px;
    height: 20px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    inset: 0;
    background: #ccc;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.2s;
}

.slider::before {
    content: '';
    position: absolute;
    width: 14px;
    height: 14px;
    left: 3px;
    top: 3px;
    background: white;
    border-radius: 50%;
    transition: transform 0.2s;
}

.switch input:checked + .slider {
    background: #393939;
}

.switch input:checked + .slider::before {
    transform: translateX(16px);
}