مشكلة فى حجم الصورة فى نسخة الموبايل

/* css respoonsive mobile img forumotion hotrofm.net */
.post-content img{max-width:800px}
@media (max-width:1200px){.post-content img{max-width:700px}}
@media (max-width:1024px){.post-content img{max-width:600px}}
@media (max-width:800px){.post-content img{max-width:500px}}
@media (max-width:600px){.post-content img{max-width:400px}}
@media (max-width:480px){.post-content img{max-width:300px}}
@media (max-width:320px){.post-content img{max-width:280px}}