html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
    position: relative;
    min-height: 100%;
    scroll-behavior: smooth;
}

body {
  margin-bottom: 60px;
  padding-top:56px;
}
.hero-section {
    background: linear-gradient(rgba(0, 128, 0, 0.6), rgba(0, 128, 0, 0.6)), url('/images/hero.jpg') center/cover no-repeat;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}
navbar.scrolled {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

3. Optional JavaScript for scroll