Top_buttons{
    color:rgb(0,0,0)
}
div.container4 p {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%) }

.overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(27,37,43,0.8);
  transition: opacity 200ms;
  visibility: hidden;
  opacity: 0;
}

.popup {
  margin: 140px auto;
  padding: 20px;
  background: #fff;
  border: 1px solid #666;
max-width: 70%;
  width: auto;
  box-shadow: 0 0 50px rgba(0,0,0,0.5);
  position: relative;
}

.overlay:target {
  visibility: visible;
  opacity: 1;
}

.close {
  position: absolute;
  width: 20px;
  height: 20px;
  top: 20px;
  right: 20px;
  opacity: 0.8;
  transition: all 200ms;
  font-size: 24px;
  font-weight: bold;
  text-decoration: none;
  color: #666;
}
img {
    max-width: 100%;
    height: auto;
    width: auto; /* ie8 */
}