Hi I have some troubles with a "margin" in mozilla, explorer, safari and chrome for IOS.
For Mozilla and Explorer I solved with
/*Styles for Firefox*/
@-moz-document url-prefix() {
    .box img {
        width: 100%;
    }
.box .info{
    margin-left: -70% !important;}
}
/* Styles for IE10*/
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
    .box img {
        width: 100%;
    }
    .box .info{
   margin-left: -70% !important;}
}
What about Safari?
 
    