body {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#container {
    background-color: rgb(93, 93, 93);
    width: 75%;
    display: flex;
    flex-direction: column;
    border-radius: 5%;
    height: 900px;    
    max-width: 700px;
    border: solid 2px black;
}

#screen {
    flex: 1;
    min-height: 10px;
    background-color: rgb(174, 235, 235);
    border-radius: 10%;
    margin: 50px;
    margin-bottom: 35px;
    padding: 20px;
    font-size: 400%;
    border: solid 2px black;
}

#buttons {
    flex: 3;
    margin: 45px;
    margin-top: 35px;
    display: flex;
    padding: 10px;
    flex-wrap: wrap;
}

#buttons div {
    margin: auto;
    height: 13%;
    width: 20%;
    border: solid 2px black;
    border-radius: 10%;
    display: flex;
    justify-content: center;    
    align-items: center;
    font-size: 56px;
    font-weight: bold;
    background-color: white;
}

#buttons div:hover {
    background-color: aliceblue;
}

#buttons .activated {
    transform: scale(0.95);
    background-color: rgb(169, 194, 214);
}