.field--name-body img,
.field--type-text-with-summary img {
    max-width: 100%;
    height: auto; /* Maintain aspect ratio */
    display: block; /* Avoid extra space below the image */
    margin: 0 auto; /* Center the image horizontally */
}

/** two column layout images **/

.group-left img {
    max-width: 100%;
    height: auto;
    padding-right: 5px;
}