body {
    background-color: black;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-content: center;
}

.container {
    display: grid;
    grid-template-columns: 1;
    grid-template-rows: 2;
    margin-top: 10%;
    border: 7px solid gold;
    border-radius: 10px;
}

.container .screen-container {
    background-color: white;
    height: 90px;
    margin: 5px 5px 5px 5px;
}

#screen {
    text-align: center;
    font-size: 20px;
    font-weight: bold;
    color: black;
    width: 98%;
    height: 95%;
}

.container .buttons-container button {
    width: 90px;
    height: 90px;
    background-color: antiquewhite;
    font-size: 1.5em;
    font-weight: bold;
    border-radius: 10px;
}

.buttons-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    padding: 5px;
}

.buttons-container button:hover {
    background-color: aliceblue;
}

.clear-btn button {
    width: 100%;
    height: 90px;
    background-color: antiquewhite;
    font-size: 1.5em;
    font-weight: bold;
    border-radius: 10px;
}

.clear-btn button:hover {
    background-color: aliceblue;
}