.container {
    justify-self: center;
    align-self: center;

    display: grid;

    width: 400px;
    height: 400px;

    border-radius: 5px;
    background-color: lightgreen;
    box-shadow: 7px 7px 7px rgba(0, 0, 0, 0.15);
}

.container-form {
    justify-self: center;
    align-self: center;
}