style.css

#js--sc--container {
  position: relative;
  margin: 0 auto;
  width: 375px;
  height: 667px;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  opacity: 1;
  animation: move 2s;
}

#js--sc--container canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

#js--sc--container img {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

#js-debug-cursor {
  position: absolute;
  top: 0;
  left: 0;
  background-color: yellow;
  width: 50px;
  height: 50px;
  z-index: 99;
  will-change: transform;
  -webkit-transition-duration: 300ms;
  transition-duration: 300ms;
}

.sc__wrapper {
  display: block;
  width: 100%;
  height: 300px;
  max-width: 300px;
  margin: 0 auto;
  border: 5px solid rgba(#FFF, 0.5);
}

 /* Where the scratchcard will be generate. */
.sc__container {
  position: relative;
  overflow: hidden;
  max-height: 300px;
  max-width: 300px;
}

.sc__inner {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

 /* Background image, the result... */
.sc__container > img {
  position: relative;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
}

 /* The scratchcard generate with scratchcard-js */
.sc__container canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
}

 /* Scratchcard informations */
.sc__infos {
  text-align: center;
  height: 40px;
  line-height: 40px;
  margin-top: 5px;
  font-weight: bold;
  font-size: 16px;
}

.text {
  color: lightsalmon;
  font-size: 20px;
  font-family: sans-serif;
  text-align: center;
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
}

body {
  margin: 0px;
  background-color: black;
}