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; */
  box-shadow: none;
  outline: none;
}

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

body {
  margin-bottom: 60px;
}

.main-content {
  background-image: url(../images/cars-bg-1.jpg);
  position: relative;
  background-size: cover;
  background-position: center;
}

.main-content::after {
  content: "";
  position: absolute;
  inset: 0;
  /* shorthand for top:0; right:0; bottom:0; left:0 */
  background: rgba(128, 128, 128, 0.5);
  /* gray overlay, 50% opacity */
}

.content-placeholder {
  min-height: 800px;
  position: relative;
  z-index: 1;
  /* ensures content is above the overlay */
  /*adding a white transparent background to improve text visibility*/
  background: rgba(255, 255, 255, 0.8);
}

.modal-backdrop {
  z-index: 0;
}