body {
    background-image: url('wallpaper.jpg');
    background-size: cover;
    display: flex;
    align-items: center;
    flex-direction: column;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0px;
}

#fireworks {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: url('fireworks.gif');
    background-size: cover;
    opacity: 50%;
}

h1 {
    font-size: 100px;
    color: red;
    z-index: 100;
}

h1:hover {
    color: black;
}

button {
    padding: 15px;
    font-size: large;
    border: 2px solid red;
    border-radius: 5px;
    background-color: transparent;
    color: red;
    z-index: 100;
}

button:hover {
    background-color: rgba(255, 0, 0, 0.2);
    color: white;
    cursor: pointer;
}