body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: black;
    margin: 0;
    font-family: sans-serif;
}

#calc-grid {
    display: grid;
    grid-template-columns: repeat(4, 100px);
    grid-template-rows: minmax(120px, auto) repeat(5, 100px);
    gap: 5px;
    background: black;
    border: 2pt solid rgba(247, 144, 144, 0.281); /* shorthand: width, style, color */
    padding: 10px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

#display {
    grid-column: span 4;
    background: #645050;
    color: rgb(255, 241, 220);
    font-size: 2rem;
    display: flex;
    justify-content: flex-end; /* texte à droite */
    align-items: center;        /* centré verticalement */
    padding: 0 10px;
    border-radius: 5px;
    border-color: antiquewhite;
}

.span-two {
    grid-column: span 2;
}

button {
    font-size: 1.5rem;
    color: rgb(150, 2, 2);
    border: 2pt solid rgba(247, 144, 144, 0.514); /* shorthand: width, style, color */
    background: black;
    cursor: pointer;
    transition: background 0.2s;
}


button:hover {
    background: #d0d0d0;
}