* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Times New Roman", Times, serif;
}

.container {
  padding: 20px;
  width: 100vw;
  display: flex;
  flex-direction: column;
  align-items: center;
  row-gap: 1rem;
}

.title {
  text-align: center;
}

.container_control {
  display: flex;
  flex-direction: column;
  row-gap: 1rem;
}

.container_buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0 10px;
}
.container_buttons input {
  padding: 6px;
}

.arrow_button {
  width: 3rem;
  height: 3rem;
  line-height: 3rem;
  display: flex;
  justify-content: center;
  align-items: center;
  color: black;
  font-size: 2rem;
  border: solid 2px black;
  border-radius: 50%;
  text-decoration: none;
}
.arrow_button:hover {
  color: gray;
  border-color: gray;
}
.container_arrow_buttons {
  display: grid;
  justify-content: center;
}
#up_arrow {
  grid-column: 2/3;
  grid-row: 1/2;
}
#up_arrow:before {
  content: "▲";
}
#down_arrow {
  grid-column: 2/3;
  grid-row: 3/4;
}
#down_arrow:before {
  content: "▼";
}
#left_arrow {
  grid-column: 1/2;
  grid-row: 2/3;
}
#left_arrow:before {
  content: "◀";
}
#right_arrow {
  grid-column: 3/4;
  grid-row: 2/3;
}
#right_arrow:before {
  content: "▶";
}
@media screen and (max-width: 540px) {
  #canvas {
    width: 400px;
    height: 400px;
  }
}
@media screen and (max-width: 420px) {
  #canvas {
    width: 340px;
    height: 340px;
  }
}