.sliderOverlay {
    display:none;
  background: rgba(0,0,0,.5);
  width:      100%;
  height:     100%; 
  z-index:    9999;
  top:        0; 
  left:       0; 
  position:   fixed; 
}

.widthCentertGallery{width:650px; margin:auto;}

.sliderOverlay-content {
    height:400px; width:650px;  border:solid #555555 1px; background-color:#fff; color:#555; padding:40px; font-size:18px;
}

.clear {
    clear:both;
}

@media(max-width:750px) {
    .widthCentertGallery{width:100%;}
    .sliderOverlay-content {
    height:400px; width:100%;  border:solid #555555 1px; background-color:#fff; color:#555; padding:40px; font-size:14px;
}
    }