.ontopx {
  display: flex;
  position: fixed;
  top: -20px;
  left: 0px;
  width: 100vw;
  height: calc(100vh + 40px);
  background: white;
  justify-content: center;
  align-items: center;
  z-index: 10;
}
.ontopx.hide {
  display: none;
}

.ontopx img {
  display: block;
  width: 100px;
  height: 100px;
  min-width: 100px;
  min-height: 100px;
  margin: auto;
}