Lamp app style.css

style.css

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

body {
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
}

a {
  text-decoration: none;
}

.container {
  text-align: center;
  color: white;
  z-index: 1000;
}

.container i {
  font-size: 10em;
  text-shadow: 0 0 10px #000;
}

#the-light {
  opacity: 0;
  display: block;
  position: fixed;
  width: 640px;
  height: 640px;
  top: 50%;
  left: 50%;
  margin-left: -320px;
  margin-top: -320px;
  border-radius: 320px;
  z-index: 0;
  background: radial-gradient(ellipse at center, rgba(255,255,255,1) 0%,rgba(0,0,0,1) 70%);
}