html {
  background: url('images/bars.png') 0 0 repeat, black;
}

body {
  font-family: "Arial", monospace;
  font-size: 20px;
}

.container_main {
  margin-left: 20%;
  margin-right: 20%;
  margin-top: 0%;
  background: url('images/kabe2.png');
  border: 24px solid orange;
  border-image: url('images/dice border.png') 48 stretch;
  padding: 1%;
}

.gallery {
  display: flex;
}

.gallery div {
  padding: 5px;
}

.gallery img {
  max-width: 100%;
}