<div class="module-border-wrap"><div class="module">
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</div></div>

body {
  height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  background: #222;
}

.module-border-wrap {
  max-width: 250px;
  padding: 1rem;
  position: relative;
  background: linear-gradient(to right, red, purple);
  padding: 3px;
}

.module {
  background: #222;
  color: white;
  padding: 2rem;
}