.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9999;
  opacity: 0.98;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 
              0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.form-wrapper {
    width: 50%;
    margin: 0 auto;
    padding: 30px;
    border: 2px solid cyan;
    border-radius: 20px;
    background: #f8ffff;
    box-sizing: border-box;
}

@media (max-width: 768px) {
  .header-image {
    display: none;
  }
	.form-wrapper {
			width: 100%;
	}
}