body {
    background-color: rgb(235, 235, 235);
    padding: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh; /* Ensure the body takes the full height of the viewport */
    margin: 0; /* Remove default margin */
}

.b {
    background-color: rgb(255, 255, 255);
    padding: 5px;
    border-radius: 5px;
    box-shadow: 0px 0px 5px 0px rgba(0, 0, 0, 0.5);
    width: 30vw;
    height: 10vh;
    font-size: 5vh;
}