CODE wip

<style>
body {
  background-color: #FFFFFF;}

.rainbow-box {
  background-image: url("https://i.imgur.com/a3r8JcW.jpg");
  image-repeat: no-repeat;
  border: 5px dashed transparent;
  border-image: linear-gradient(to bottom right, #b827fc 0%, #2c90fc 25%, #b8fd33 50%, #fec837 75%, #fd1892 100%);
  border-image-slice: 1;
  height: 900px;
  margin-top: 20px auto;
  margin-left:100px;

  width: 600px;
}
</style>

<html>
	<div class="rainbow-box"></div>
</html>