.x-form-file-wrap {
    position: relative;
    height: 22px;
}
.x-form-file-wrap .x-form-file {
	position: absolute;
	right: 0;
	-moz-opacity: 0;
	filter:alpha(opacity: 0);
	opacity: 0;
	z-index: 2;
    height: 22px;
}
.x-form-file-wrap .x-form-file-btn {
	position: absolute;
	right: 0;
	z-index: 1;
}
.x-form-file-wrap .x-form-file-text {
    position: absolute;
    left: 0;
    z-index: 3;
    color: #777;
}

/*immagini*/
.silk-add { background-image: url(../Content/images/application_add.png) !important; background-repeat: no-repeat; }
.silk-delete { background-image: url(../Content/images/application_delete.png) !important; background-repeat: no-repeat; }
.silk-edit { background-image: url(../Content/images/application_edit.png) !important; background-repeat: no-repeat; }
.pdf-upload { background-image: url(../Content/images/drive_add.png) !important; background-repeat: no-repeat; }
.key-change { background-image: url(../Content/images/key_go.png) !important; background-repeat: no-repeat; }