body {
  display: flex;
  flex-direction: column;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1em;
  margin: 0;
  padding: 0;
  height: 100vh;
  width: 100vw;
  user-select: none;
}
canvas {
  display: inline-block;
  box-shadow: 0px 0px 5px 0px hsla(0, 0%, 0%, 0.2);
  box-sizing: border-box;
}
.container {
  flex: 1;
  overflow: auto;
  text-align: center;
}
.toolbar {
  display: flex;
  justify-content: flex-end;
  height: auto;
  padding: 10px;
  background-color: #ebedf0;
  border-top: 1px solid #1ca1c1;
}
.toolbar > * {
  padding: 0 5px;
}

#calc {
  display: none;
}