body {
  padding: 50px;
}

.relative {
  position: relative;
  padding: 40px 0;
}

.loading {
  animation: pulse 1.5s infinite;
  background-color: #666;
  border-radius: 50%;
  font: 0/0 serif;
  position: absolute;
}

.shaked {
  background-color: #990000;
  border: 1px solid #990000;
  background-image: linear-gradient(top, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0));
  text-shadow: -1px -1px 1px rgba(0, 0, 0, 0.4);
  text-decoration: none;
  border-radius: 5px;
  color: white;
  font-weight: bold;
  padding: 5px 10px;
  font-size: 0.8em;
  position: absolute;
}

.shaked:hover {
  animation: shake 3s;
}

h1 {
  animation: appear 2s 0s linear;
  color: #000;
  font-size: 1.4em;
  text-align: center;
  transform: scale(1.2);
  transform-origin: 50% 50%;
}

@keyframes appear {
  0% {
    opacity: 0;
    transform: scale(2);
  }
  70% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    transform: scale(1.2);
  }
}

@keyframes shake {
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-15px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(15px);
  }
}

@keyframes pulse {
  0% {
    width: 0;
    height: 0;
    opacity: 1;
    top: 50px;
    left: 50px;
  }
  100% {
    width: 30px;
    height: 30px;
    opacity: 0;
    top: 35px;
    left: 35px;
  }
}