body>.main {
    overflow: hidden;
    background-color: rgb(223, 231, 239);
    background-image: url(../images/questionnaire-bg.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
}