body,
html {
    height: 100%;
    margin: 0;
}

.background-container {
    background-image: url('spaceship.gif');
    /* Link to your space background gif */
    height: 100%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
}

button {
    padding: 10px 20px;
    font-size: 20px;
    color: white;
    background-color: #000080;
    /* Navy blue */
    border: none;
    border-radius: 5px;
    cursor: pointer;
    opacity: 0.7;
}

button:hover {
    opacity: 1;
}