<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: 28px solid #666;
  border-image-source: url(https://openclipart.org/image/2400px/svg_to_png/222492/Decorative-Ornamental-Frame-Border-2.png);
  border-image-slice: 170; 
  border-image-repeat: stretch; 
}

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