body
{
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #8AA6A3;

}
.calculator
{
    font-family: Arial, Helvetica, sans-serif;
    background-color: black;
    border-radius: 15px;
    max-width: 500px;
    overflow: hidden;
}
#display
{
    width: 100%;
    padding: 20px;
    font-size: 5rem;
    text-align: left;
    border: none;
    background-color: rgb(40, 36, 36);
    color: white;
}
#keys
{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding: 25px;
}
button
{
    width: 100px;
    height: 100px;
    border-radius: 50px;
    font-size: 3rem;
    background-color: rgb(41, 38, 38);
    color: white;
    border: none;
    cursor: pointer;
}
button:hover
{
    background-color: rgb(80, 77, 77);
}
button:active
{
    background-color: rgb(41, 38, 38);
}

.operator
{
    background-color: rgb(255, 165, 0);
}
.operator:hover
{
    background-color: rgb(255, 165, 90);
}
.operator:active
{
    background-color: rgb(255, 165, 90);
}