style.css

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@100&display=swap');

:root {
    --font-family: 'Montserrat', sans-serif;
    --bg-color: #0aa1dd;
    --primary-color: #fde8e8;
    --bg-color-gameover: #4e0000;
}

body {
    background-color: var(--bg-color);
    color: var(--primary-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    margin: 0;
    font-family: var(--font-family);
}

h1 {
    font-size: 5em;
}

h2{
    font-size: 4em;
}

h3 {
    font-size: 2em;
    margin-top: 20px;
}

.mensagem {
    font-size: 1.5em;
    margin-top: 40px;
}

.box {
    border: 2px solid var(--primary-color);
    display: inline-block;
    font-size: 4em;
    padding: 10px;
    margin: 20px;
}

.btn-jogar{
    padding: 8px 15px;
    border: 0;
    background: var(--primary-color);
    border-radius: 5px;
    margin-top: 20px;
    cursor: pointer;

    transition: filter .3s;
    filter: drop-shadow(0 0 0 transparent);
}

.btn-jogar:hover {
    filter: drop-shadow(0px 0px 0.5rem rgb(0, 0, 0));
}

.game-over{
    background-color: var(--bg-color-gameover);
}