.diagnosis_intro_div {
    background-image: url('https://dummyimage.com/600x400/a8a8a8/ffffff');
    width: 600px;
    height: 400px;
    margin: 0 auto;
    padding-top: 100px;
    text-align: center;
}
.diagnosis_intro_text{
    margin: 0 auto;
    width: 250px;
    font-size: 1.4rem;
    font-weight: bold;
}
.diagnosis_intro_go_Btn {
    border-radius: 50px;
    padding: 10px;
    color: white;
    background: #2b2b2b;
    border: 2px solid white;
    font-size: 1.3rem;
    font-weight: bold;
}

@media all and (max-width: 768px) {
    .diagnosis_intro_div {
        background-image: url('https://dummyimage.com/320x192/a8a8a8/ffffff');
        width: 320px;
        height: 192px;
        padding-top: 20px;
    }
}