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;
    /*margin: 0;*/
    /*color:cadetblue;*/
}
.img-preview {
    position: relative;
}

    .img-preview span {
        display: none;
        position: absolute;
        top: 20px;
        left: 0;
        z-index: 9999;
    }

    .img-preview:hover span {
        display: block;
    }

    .img-preview img {
        width: 300px; /* adjust preview size */
        height: auto;
        border: 2px solid #fff;
        box-shadow: 0 0 10px #000;
        border-radius: 6px;
    }