body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Arial, Helvetica, sans-serif;
    overflow: hidden;
}

#interest-calculator {
    background-color: whitesmoke;
    border: 5px solid lightgray;
    width: 400px;
    height: 550px;
    border-radius: 25px;
    padding: 10px;
    text-align: center;
}

#interest-calculator .input-block {
    margin-bottom: 10px;
    text-align: right;
}

#calculate-button {
    width: 175px;
    height: 50px;
    font-size: 1em;
}

#result {
    font-size: 2em;
}