* {
  margin: 0;
  padding: 0;
}

html,
body {
  height: auto;
}
.panel {
  height: 100dvh;
  /*   position: sticky; */ /* causes problems! */
  top: 0;
}

.panel-one {
  text-align: center;
}
.panel-one > img {
  margin-top: 55vh;
  width: 80%;
  max-width: 800px;
}
@media screen and (max-width: 600px) {
  .panel-one > img {
    width: 90%;
  }
}

.panel-two {
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.panel-four {
  height: 70dvh;
}