canvas {
  touch-action: none;
}

body {
  margin: 0;
  padding: 0;
  text-size-adjust: none;
  overflow: auto;
}

dialog.dialog {
  font-family: Arial, Helvetica, sans-serif;
  overflow: auto;
}

.dialog {
  max-height: 100%;
  box-sizing: border-box; /* Add this line */
}

fieldset.dialog {
  border: 2px #dddddd solid;
  margin: 0;
}

legend.dialog {
  color: gray;
}

ul.dialog {
  /* padding: 0;  */
  padding-inline-start: 1rem;
  margin: 0;
}

div.dialog-button {
  --size: 2.5rem;
  position: absolute;
  z-index: 1000;
  top: 0;
  left: 0;
  width: var(--size);
  height: var(--size);
  cursor: pointer;
  background-color: rgba(255, 255, 0, 0.5);
  border-bottom-right-radius: 10%;
}

div.dialog-button > div {
  width: 80%;
  height: calc(100% / 7);
  background: black;
  /* box-shadow: -1px -1px 0 black, 1px -1px 0 black, -1px 1px 0 black, 1px 1px 0 black;; */
  display: block;
  margin: auto;
  margin-top: calc(100% / 7);
  transition: all 0.3s;
  border-radius: 10%;
}

div.dialog-button > div:last-child {
  margin-bottom: calc(100% / 7);
}

div.dialog-button.open > div.a {
  transform: translateY(200%) rotate(45deg);
}
div.dialog-button.open > div.b {
  opacity: 0;
}
div.dialog-button.open > div.c {
  transform: translateY(-200%) rotate(-45deg);
}