Calculator-CSS

#calc {
    width: 250px;
    height: 320px;
    border: 2px solid black;
    text-align: center;
    table-layout: fixed;
}
    #calc button {
        width: 100%;
        height: 110%;
        font-size: 130%;
    }
    #calc button:hover {
        background-color: darkgray;
    }
    #calc #display {
        width: 98%;
        height: 50px;
        text-align: right;
        font-size: 180%;
    }

::-webkit-input-placeholder {
    color: black;
}