body {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url("img/dog_walkx4.gif");
}

#content {
  text-align: center;
  margin-top: 50px;
}

p {
  font-size: 140%;
  color: rgb(255, 252, 203);
  text-shadow: 1px 1px #000000;
  border: 12px solid rgb(18, 78, 105);
}

h1 {
    font-size: 72px;
    color: white;
    text-shadow: 2px 2px #000000;
    animation: rainbow 3s infinite;
}

@keyframes rainbow {
    0% {
      color: red;
    }
    14.28% {
      color: orange;
    }
    28.56% {
      color: yellow;
    }
    42.84% {
      color: green;
    }
    57.12% {
      color: blue;
    }
    71.4% {
      color: indigo;
    }
     85.68% {
      color: violet;
    }
    100% {
      color: red;
    }
}