* {
  margin: 0;
  padding: 0;
  text-decoration: none;
}

body {
  background: #1b1b1b;
}

main {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

footer {
  position: absolute;
  width:100%;
  bottom: 0px;
  text-align: center;
  padding-bottom: 15px;
}

a {
  font-family: verdana;
  color: white;
  text-shadow: 1px 1px black;
}

a:hover {
  color:gray;
}

img {
  max-width: 50vw;
  max-height: 50vh;
}   

.pulse {
  border-radius: 50%;
  animation: animate 3s linear infinite;
}

@keyframes animate {
  0% { box-shadow: 0 0 0 0 #ccc5, 0 0 0 0 #ccc5; }
  40% { box-shadow: 0 0 0 90px #ccc0, 0 0 0 0 #ccc5; }
  80% { box-shadow: 0 0 0 90px #ccc0, 0 0 0 70px #ccc0; }
  100% { box-shadow: 0 0 0 0 #ccc0, 0 0 0 70px #ccc0; }
}