main div.demobox {
  display: block;
  overflow: hidden;
  box-sizing: border-box;
  border: 1px solid var(--color2);
  border-radius: 4px;
  background-color: #ffffff;
  padding: 20px;
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  margin-bottom: 50px;
}