.content
{
  position: absolute;
  left: 0;
  top: 45%;
  width: 100%;
  height: 100%;
  color: white;
  font-family: Arial, Helvetica, sans-serif;
}

.modal-content {
  background-color: #060606d6;
}

.close {
  color: #fff;
}

.invisible {
    visibility: hidden;
    position: absolute;
    top: -9999px;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    margin: 0;
}