body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
}

.container {
    width: 100%;
    height: 100vh;
    background-color: rgb(228, 255, 249);
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator {
    width: 320px;
    padding: 20px;
    border-radius: 20px;
    background-color: rgb(47, 44, 50);
}

.screen {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

#displayInput {
    width: 100%;
    padding: 20px;
    border-radius: 15px;
    border: none;
    background: rgba(255, 255, 255, 0.08);
    color: white;
    font-size: 38px;
    text-align: right;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, minmax(60px, 1fr));
    gap: 12px;
}

.buttons button {
    border: none;
    outline: none;
    height: 60px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.06);
    color: white;
    font-size: 22px;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
}

.buttons button:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.12);
}

.buttons button.operator {
    color: rgba(0, 255, 255, 0.85);
}

.buttons button.equal {
    grid-column: span 2;
    background: rgba(0, 255, 255, 0.2);
}

body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
}

.container {
    width: 100%;
    height: 100vh;
    background-color: rgb(228, 255, 249);
    display: flex;
    justify-content: center;
    align-items: center;
}