.banner {
    background: url('images/klinik.jpg');
    position: relative;
    min-height: 100vh;
    background-size: cover;
    background-position: center;
    padding: 250px 40px 200px;
    opacity: 1;
}

.thumb {
    margin-top: -20px;
    position: relative;
    background-color: white;
}