<style>
.sticky-auth-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99999;
  display: flex;
  width: 100%;
  box-shadow: 0 -4px 20px rgba(0,0,0,.35);
}

.sticky-auth-bar a {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 10px;
  color: #fff !important;
  font-size: 20px;
  font-weight: 700;
  text-decoration: none !important;
  line-height: 1.2;
}

.sticky-auth-bar .btn-login {
  background: linear-gradient(90deg, #f39c12 0%, #f1c40f 100%);
  border-radius: 12px 0 0 0;
}

.sticky-auth-bar .btn-register {
  background: linear-gradient(90deg, #c0392b 0%, #e74c3c 100%);
  border-radius: 0 12px 0 0;
}

/* biar konten tidak ketutup button */
body {
  padding-bottom: 70px !important;
}

@media (max-width: 480px) {
  .sticky-auth-bar a {
    font-size: 16px;
    padding: 14px 8px;
  }
}
</style>

<div class="sticky-auth-bar">
  <a class="btn-login" href="https://t.ly/cipuy">เข้าสู่ระบบ</a>
  <a class="btn-register" href="https://t.ly/cipuy">สมัครสมาชิก</a>
</div>