body {
    height: 90vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

#main_container {
    border: 1px solid #f0f8ff;
    border-radius: 2%/4%;
    width:50vw;
    height: 40vh;
}

#container_for_digits {
    display: flex;
    width: 100%;
    justify-content:space-around;

}
#main_container p {
    font-size: 3rem;
    text-align: center;
}

.amount, .amount:hover, .amount:focus {
    border-radius: 5%/6%;
    width: 10vw;
    height: 17vh;
    font-size: 2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}