body {
    font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    -webkit-text-stroke: 0.5px black;
    background-image: url(bg2.png), url(bg1.webp);
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center; 
    -webkit-background-size: cover;
    background-size: cover;
}
div.intro {
    background-color: rgba(0, 0, 0, 0.5);
    padding: 20px;
    margin: 20px;
    border-radius: 10px;
}
div.intro p {
    text-align: center;
    font-size: 2em;
    color: white;
}
div.flex {
    width: 80%;
    margin: auto;
    display: flex;
    justify-content: center;
}
a {
    color: #13C800;
}
a.button {
    font: bold 20px Arial;
    text-decoration: none;
    background-color: #13C800;
    color: #333333;
    padding: 10px 100px 10px 100px;
}
a.button:hover {
    background-color: #15E000;
}