.calculator {
    background-color: #2c2c2c;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    width: 320px;
    overflow: hidden;
}

.calc-display {
    background-color: #1e1e1e;
    color: #fff;
    font-size: 1.5rem;
    text-align: right;
    padding: 25px;
    overflow: hidden;
    word-wrap: break-word;
}

.calc-btn-wrapper {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 4px;
    padding: 8px;
}

.calc-btn-wrapper .calc-btn {
    background-color: #3b3b3b;
    border: none;
    outline: none;
    color: white;
    font-size: 1rem;
    /* padding: 12px 8px; */
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    min-height: 40px;
}

.calc-btn-wrapper .calc-btn:hover {
    background-color: #505050;
}

.calc-btn-wrapper .operator {
    background-color: #4a4a4a;
}

.calc-btn-wrapper .operator.base {
    font-size: 1.2rem;
}

.calc-btn-wrapper .equal {
    background-color: #00bcd4;
}

.calc-btn-wrapper .equal:hover {
    background-color: #00a3b8;
}