body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    margin: 0;
    height: 100vh;
    padding: 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

/* Calculator */

.calculator {
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 300px;
    margin: 0 auto;
    padding: 40px;
    display: flex;
    flex-direction: column;
}

.calculator input {
    width: 100% auto;
    padding: 25px;
    font-size: 18px;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin-bottom: 10px;
}

.tombol {
    display: block;
    flex-wrap: wrap;
    flex-direction: row;
}

.btn {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px;
    margin: 3px 3px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    width: 20%;
    height: 50px;
}

.operator{
    background-color: #28a745;
}

.clear {
    background-color: #666666;
}

.results {
    background-color: #dc3545;
    width: 95%;
}

.btn:hover {
    background-color: #0056b3;
}