body {
  opacity: 1;
  transition: 1s opacity;
  color: #fff;
  font-family: 'Arial', sans-serif;
  background-color: #000;
  margin: 15%;
  padding: 50px;

}

body.fade-out {
  opacity: 0;
  transition: none;
}

html {
  background-color: black;
}
        footer {
            background-color: #000;
            color: #000;
            text-align: center;
            padding: 0px;
            position: fixed;
            bottom: 100px;
            width: 100%;
        }


        a:link {
          color: black;
        }

        a:visited {
          color: green;
        }

        a:hover {
          color: green;
        }

        a:active {
          color: blue;
        }