/* styles.css */
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f4f4f4;
}

.calculator {
    border-radius: 5px;
    box-shadow: 0px 0px 12px -1px rgba(0,0,0,0.75);
}

.calculator-screen {
    width: 95.3%;
    height: 80px;
    background-color: #252525;
    color: white;
    text-align: right;
    padding: 0 10px;
    font-size: 2.2em;
    border: none;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
}

.calculator-keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

button {
    height: 60px;
    font-size: 1.4em;
    border: 1px solid #e4e4e4;
    background-color: white;
    color: black;
}

button.operator {
    background-color: #f9a825;
    color: white;
}

button.equal-sign {
    background-color: #43a4ff;
    color: white;
    grid-column: span 2;
}

button.all-clear {
    background-color: #d32f2f;
    color: white;
    grid-column: span 2;
}

button:active {
    background-color: #d9d9d9;
}