object-fit not working

#include <stdio.h>

int main() {
    printf("Content-Type: text/html\n\n");
    printf("<html>\n");
    printf("<head>\n");
    printf("<style>\n");
    printf("  .container {\n");
    printf("    width: 200px;\n");
    printf("    height: 200px;\n");
    printf("    border: 1px solid black;\n");
    printf("    overflow: hidden;\n");
    printf("  }\n");
    printf("  .image {\n");
    printf("    width: 100%;\n");
    printf("    height: 100%;\n");
    printf("    object-fit: cover;\n");
    printf("  }\n");
    printf("</style>\n");
    printf("</head>\n");
    printf("<body>\n");
    printf("<div class=\"container\">\n");
    printf("  <img class=\"image\" src=\"your_image_url.jpg\" alt=\"Your Image\">\n");
    printf("</div>\n");
    printf("</body>\n");
    printf("</html>\n");

    return 0;
}