body {
    background-color: rgb(5, 5, 5);
    color: bisque;
    font-family: 'Courier New', Courier, monospace;
    opacity: 0;
    transition: opacity 2s ease-in-out;
}
* {
    transition: opacity 2s ease-in-out;
}
#main {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    border: none;
    display: inline-block;
    box-sizing: border-box;
}
button {
    border-radius: 15px;
    padding: 10px;
    background-color: darkgray;
    color: rgb(26, 64, 236);
}
.upgrade-image {
    width: 20px;
    height: 20px;
}