html {
  width: 100%;
  height: 100%;
  min-height: 500px;
}

body {
  background: linear-gradient(to top, #d2dae9, white);
  margin: 0;
  background-repeat: no-repeat;
  background-attachment: fixed;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#card {
  min-width: 640px;
  min-height: 480px;
  box-shadow: 0px 50px 50px rgba(0, 0, 0, 0.35);
  background: #31323f;
  touch-action: none;
}

#canvas {
  position: absolute;
  pointer-events: none;
}

#signature {
  margin-top: 10px;
  padding-bottom: 20px;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  font-family: "Courier New", Courier, monospace;
  color: black;
  user-select: none;
}

a,
a:visited {
  color: inherit;
}