.image-container {
    position: relative;
    width: 100%;
    padding-bottom: 75%; /* 4:3 ratio (3/4 = 0.75) */
    overflow: hidden;
}

.image-container img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}