/* Reset margin and padding */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    display: flex;
    justify-content: center;  /* Center horizontally */
    align-items: center;      /* Center vertically */
    background-color: #f0f0f0;
}

.center-div {
    background-color: #8BC34A;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    color: white;
    font-size: 18px;
}