.container {
    max-width: 1601px;
    margin: 10vh auto 0 auto;
    box-shadow: 0px 0px 43px 17px rgba(153,153,153,1);
    
}

#display {
    text-align: right;
    height: 70px;
    line-height: 70px;
    padding: 16px 8px;
    font-size: 25px;
    background-color: rgb(0, 0, 0);
    color: white;
}

.buttons {
    display: grid;
    border-bottom: 1px solid #999;
    border-left: 1px solid#999;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    background-color: #000000;
    color: white;
}

.buttons > div {
    border-top: 1px solid #999;
    border-right: 1px solid#999;
}

.button {
    border: 0.5px solid #999;
    line-height: 100px;
    text-align: center;
    font-size: 25px;
    cursor: pointer;
}

#equal {                /* equals button is a different color so it stands out */
    background-color: rgb(140, 0, 255);
    color: white;
}

.button:hover {         /* animation on hovering over buttons */
    background-color: #ffffff;
    color: #282925;
    transition: 0.05s ease-in-out;
}

.button:active {        /* animation on clicking buttons */
    background-color: #6e0a6e;
    color: #282925;
    transition: 0.05s ease-in-out;
}