body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;

    font-family: sans-serif;
}

.card {
    height: 250px;
    width: 200px;

    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    box-shadow:
        0 4px 8px 0 rgba(0, 0, 0, 0.2),
        0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.header {
    color: white;
    width: 100%;
    height: 100%;
    background-color: #4caf50;

    text-align: center;

    font-size: 2.5em;
}