@media screen and (max-width:319px){.thong-tin-du-an .cot2 img{max-width:50%;margin:40px 0}}@media (min-width:320px) and (max-width:480px){.thong-tin-du-an .cot2 img{max-width:50%;margin:40px 0}}@media (min-width:481px) and (max-width:768px){.thong-tin-du-an .cot2 img{max-width:50%;margin:40px 0}}@media (min-width:769px) and (max-width:991px){.thong-tin-du-an .cot2 img{max-width:50%;margin:40px 0}}