body {
    background-image: url(images/backgrounds/rainbowbackground.gif);
    font-family: "Comic Sans MS", sans-serif;
}

header {
    text-align: center;
    background-color: rgb(255, 51, 255);
}

aside {
    padding-left: 30px;
    padding-right: 30px;
    float: right;
    background-color: rgb(51, 255, 51);
    text-align: left;
}

h1 {
    background-color: rgb(51, 255, 255);
    text-align: center;
}

article {
    background-image: url(images/dirt.png);
}


#overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: black;
    font-size: 50px;
  color: white;
    display: flex;
    align-content: center;
    align-items: center;
    justify-content: center;
  }
  #overlay button {
    padding: 1rem;
    font-size: 1.5rem;
    font-weight: 900;
    border: 8px solid;
    border-top-color: #ccc;
    border-right-color: #999;
    border-left-color: #333;
    border-bottom-color: #000;
    animation: rainbow 0.5s infinite;
  }
  #overlay button:hover, #overlay button:active {
    background-color: #ccc;
    border-bottom-color: #ccc;
    border-left-color: #999;
    border-right-color: #333;
    border-top-color: #000;
  }

@keyframes rainbow {
    0% {
      background: linear-gradient(
        to right,
        red, orange, yellow, green, cyan, purple
      );
    }

    20% {
      background: linear-gradient(
        to right,
        orange, yellow, lime, cyan, magenta, red
      );
    }

    40% {
      background: linear-gradient(
        to right,
        yellow, lime, cyan, magenta, red, orange
      );
    }

    60% {
      background: linear-gradient(
        to right,
        lime, cyan, magenta, red, orange, yellow
      );
    }

    80% {
      background: linear-gradient(
        to right,
        cyan, magenta, red, orange, yellow, lime
      );
    }

    100% {
      background: linear-gradient(
        to right,
        red, orange, yellow, lime, cyan, magenta
      );
    }
  }