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%;
}

body {
  margin-bottom: 60px;
}

#overlay {
    opacity: .9;
    background: #eee;
    color: #666666;
    position: fixed;
    height: 100%;
    width: 100%;
    z-index: 5000;
    top: 0;
    left: 0;
    float: left;
    text-align: center;
    padding-top: 25%;
}

    #overlay img {
        opacity: .8;
        height: 100px;
    }