* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: gray;
}

.container {
    border-radius: 12px;
    padding: 20px;
    width: 280px;
    background-color: lightgray;
    box-shadow: 0 10px 25px rgb(0, 0, 0, 0.4);
}

h2 {
    text-align: center;
    margin-bottom: 10px;
}

#result {
    height: 50px;
    margin: 10px 0px 15px;
    width: 100%;
    font-size: 22px;
    text-align: right;
    padding: 10px;
    border-radius: 6px;
}

.buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 10px;
}

.buttons button {
    padding: 15px;
    font-size: 18px;
    border: 2px black;
    border-radius: 6px;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    transition: box-shadow 0.2s, transform 0.1s;

}

.buttons button:hover {
    background-color: rgba(255, 103, 0);
}

.operator {
    background-color: black;
    color: white;
}

#ac {
    background-color: red;
    color: white;
    box-shadow: 0 6px 10px rgba(0, 0, 0, 0.4);
}

#ac:hover {
    background-color: rgba(255, 103, 0);
}

#eq {
    background-color: black;
    color: white;
    box-shadow: 0 6px 10px rgba(0, 0, 0, 0.4);
}

#eq:hover {
    background-color: rgba(255, 103, 0);
}