body {
    padding: 0;
    margin: 0;
}

input {
    -moz-box-sizing: border-box;
}

#canvas {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    position: relative;
}

/* Chrome, Safari, Edge, Opera */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Firefox */
input[type=number] {
  -moz-appearance: textfield;
  -webkit-box-sizing: border-box;
  -webkit-width: 80%;
}