<button class="btn-brutal">
  <span class="btn-brutal-stripe" aria-hidden="true"></span>
  <span class="btn-brutal-text">SUBMIT</span>
</button>

.btn-brutal {
  position: relative;
  padding: 16px 40px;
  border: 3px solid #1a1a1a;
  border-radius: 0;
  background:
    repeating-radial-gradient(circle at 20% 30%, rgba(0,0,0,0.06) 0 1px, transparent 1px 5px),
    repeating-radial-gradient(circle at 80% 70%, rgba(0,0,0,0.05) 0 1px, transparent 1px 7px),
    #8a8a85;
  color: #1a1a1a;
  font-family: ui-monospace, monospace;
  font-size: 14px; font-weight: 900;
  letter-spacing: 0.18em;
  cursor: pointer;
  box-shadow: 6px 6px 0 #1a1a1a;
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}
.btn-brutal-stripe {
  position: absolute; left: 0; right: 0;
  top: -3px; height: 6px;
  background: #f5cb1a;
  border-bottom: 3px solid #1a1a1a;
}
.btn-brutal-text { position: relative; }
.btn-brutal:hover { transform: translate(-2px,-2px); box-shadow: 8px 8px 0 #1a1a1a; }
.btn-brutal:active { transform: translate(6px,6px); box-shadow: 0 0 0 #1a1a1a; }