style.css

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #333;
    color: #F4F4F4;
}

img {
    position: absolute;
    top: 40%;
    left: 49%;
    transform: translate(-50%, -50%);
    max-width: 100%;
    max-height: 50vh;
    width: auto;
    height: auto;
    z-index: 1;
    border: 0;
    margin: 0;
    padding: 0;
    display: block;
    background: transparent;
    transition-duration: .4s;
    cursor: pointer;
}

img:active {
    transform: translate(-50%, -50%) scale(1.1);
}

h1 {
    text-align: center;
    margin-top: 5vh;
}

#upgradeButtons {
    position: absolute;
    top: 80%;
    right: 50%;
    transform: translate(50%, -50%);
    display: flex;
    gap: 20px;
}

#upgradeButtons > button {
    background: #ddb800;
    color: #333;
    border: 0;
    padding: 1vh 2vh;
    font-size: 1.5em;
    cursor: pointer;
    transition-duration: .4s;
}

#upgradeButtons > button:hover {
    background: #c6a501;
}

#upgradeButtons > button:active {
    background: #836d00;
}

a {
    color: #ccccff;
    text-decoration: underline;
    position: absolute;
    top: 90%;
    right: 50%;
    transform: translate(50%, -50%);
}