html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  background: #008fce;
}

body,
html {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 800px;
  height: 600px;
  visibility: hidden;
}

.spot {
  width: 300px;
  height: 300px;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 50%;
}

.amp {
  position: absolute;
  top: 0;
  left: 0;
}