body{
    background-color: blue;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14pt;
    }
.introduction{
    height: 500px;
    width: 500px;
    border: 2px solid black;
    margin: 0 auto;
    padding: 20px;
    float: center;
    justify-content: center;
    background-color: darkblue;
}
input[type="button"]{
    background-color: darkblue;
    color: white;
    border: 2px black solid;
}
.link{
    display: inline-block;
    padding: 5px 10px;
    border-radius: 5px;
    color: white;
    text-decoration: none;
    background-color: purple;
    box-shadow: 2px 2px 2px black;
}
.link:hover{
    background-color: purple;
    color: pink;
}