<div class="block">
  <p>Ось такий гарний візерунок <br> замість нудної лінії...</p>
</div>
.block {
  width: 500px;
  height: 350px;
  
  font-family: sans-serif;
  font-size: 18px;
  text-align: center;
  padding-top: 12%;
  box-sizing: border-box;
  
  border: 20px solid #666;
  border-image: url(https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fopenclipart.org%2Fimage%2F800px%2Fsvg_to_png%2F259566%2FCyberscooty-Floral-Border-Extended-4.png&f=1) 65 round;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.