header .img-fluid {
    border: 1px solid #ddd;
}

.img-fluid {
    max-width: 80%;
    height: auto;
    margin: auto;
    display: block;
}

header h1 img {
    width: 2em;
    /* adjust width based on font size */
    aspect-ratio: 1 / 1;
    /* maintain 1:1 aspect ratio */
    height: auto;
    /* let height adjust proportionally */
    margin-right: 0.1em;
}

.imgLogo {
    width: 2.5em;
    /* adjust width based on font size */
    aspect-ratio: 2 / 1;
    /* maintain 1:1 aspect ratio */
    height: auto;
    /* let height adjust proportionally */
    margin-right: 0.1em;
}

@media screen and (max-width : 768px) {

    .img-fluid {
        max-width: 100%;
    }

}