body{
    margin: 0;
    padding: 0;

    height: 100vh;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.border{
    width: 300px;
    height: 300px;
    padding: 30px;
    background-color: rgba(74, 74, 74, 0.821);
    border-radius: 10px;

    display: flex;
    flex-direction: column;
    align-items: center;

    justify-content: center;
    align-content: center;
}

#area{
    font-size: 25px;
    width: 265px;
    height: 60px;
    padding: 5px 15px;

    text-align: end;

    position: relative;
    left: 0;
    right: 0;
    margin: auto;

    margin-bottom: 10px;
    border-radius: 5px;
}

#ac{
    grid-column: 1/4;
    width: 100%;
}

#clear{
    width: 100%;
    grid-column: 4/5;
}

button{
    background-color: rgb(184, 184, 184);
    border: gray 1px solid;

    width: 100%;
    height: 100%;

    font-weight: bold;
    border-radius: 5px;
}

.buttonCon{
    width: 300px;
    height: 250px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
}