* {
    box-sizing: border-box;
}

body {
    background-color: lightblue;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.box {
    border: 2px solid black;
    background-color: #fff;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    border-radius: 10px;
}

.display {
    width: 250px;
    height: 60px;
    background-color: black;
    margin-bottom: 20px;
    border-radius: 5px;
    text-align: right;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    color:#fff;
}

.buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;

}

.row {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.col {
    height: 60px;
    width: 60px;
    background-color: orange;
    color: black;
    font-size: 20px;
    font-weight: bold;
    border: 1px solid black;
    border-radius: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}