/* Smartphone Landscape Size to Tablet Portrait */ 
@media only screen and (min-width: 768px) and (max-width: 959px) {
    #sidebar-first .block img, #sidebar-second .block img{width: 50% !important}
}
/* Smartphone Portrait Size to Mobile Landscape Size */ 
@media only screen and (min-width: 480px) and (max-width: 767px) {
#container{
    #sidebar-first .block img, #sidebar-second .block img{width: 50% !important}
}
@media only screen and (max-width: 320px) {
    #sidebar-first .block img, #sidebar-second .block img{width: 50% !important}
}