body {
    font-family: 'San Francisco', Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: #000;
}

.calculator {
    background: #fff;
    padding: 20px;
    border-radius: 25px;
    width: 340px;
    box-shadow: 0 5px 15px rgba(220, 220, 220, 0.5);
}

.display {
    width: 100%;
    height: 80px;
    /* background: #fff; */
    border: none;
    /* border-radius: 15px; */
    font-size: 36px;
    padding: 10px 20px;
    padding-bottom: 8px;
    text-align: right;
    color: #000;
    /* box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.4); */
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.sub-display {
    width: 100%;
    height: 10px;
    /* background: #fff; */
    border: none;
    /* border-radius: 15px; */
    font-size: 20px;
    padding: 10px 20px;
    padding-top: 8px;
    text-align: right;
    color: #000;
    /* box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.4); */
    margin-bottom: 20px;
    letter-spacing: 1px;

}

.button {
    font-size: 20px;
    border-radius: 20%;
    width: 60px;
    height: 60px;
    border: none;
    background: #ffffff;
    color: #000000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.176);
}

.button:hover {
    font-size: 18px;
    background: #000000;
    color: #fff;
}



.button.equal {
    width: 95%;
    margin-right: 2px;
    border-radius: 10px;
    background: #ff9500;
    color: white;
}

.button.equal:hover {
    background: #cc7a00;
}

.button.operator {
    background: #ff9500;
    color: white;
}

.button.operator:hover {
    background: #cc7a00;
}

.warning-message {
    align-content: center;
    justify-items: center;
    margin-bottom: 15px;
}

.message {
    border-radius: 10px;
    padding: 3px 6px;
    color: #fff;
    background: red;
}




/* .button.zero { */
/* grid-column: span; */
/* } */