body {
    position: relative;
    height: 100vh;
    margin: 0;
}

.responsive-img {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: auto;
}

@media (max-width: 768px) {
    .responsive-img {
        top: 55px;
    }
}