:root {
    --bg-color: attr(color);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: grid;
    place-content: center;
    height: 100vh;
}

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

.container {
    display: grid;
    gap: 10px;
}

.container input {
    height: 60px;
    font-size: 1.5rem;
    text-align: center;
}

.container button {
    font-size: 1.2rem;
    padding: 12px;
}