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;
}
.header-background {
    background-image: url('/images/screenshots/web-100.jpg');
    background-size: 1300px; /* hoặc contain nếu bạn muốn ảnh không bị crop */
    background-position:center;
    background-repeat: no-repeat;
    width: 100%; height:280px;
}
@media screen and (max-width: 720px) {
    .header-background {
        background-image: url('/images/screenshots/backmobile.jpg'); /* ảnh nền dành cho mobile */
        background-size: cover; /* phù hợp với điện thoại */
        background-position: center;
    }
    .button-transparent {
        color: darkgreen; /* màu chữ */
    }
}
.header-background {
    background-color: transparent !important;
}

.container {
    background-color: transparent !important;
}
.header-background,
.header-background .container,
.header-background .navbar,
.header-background .img-thumbnail {
    background-color: transparent !important;
    box-shadow: none !important;
    border: none !important;
}

.button-transparent {
    background-color: transparent;
    border: 3px solid #007BFF; /* hoặc màu bạn muốn */
    color:  blue; /* màu chữ */
    font-size: 16px; /* cỡ chữ */
    font-weight: bold; /* in đậm */
    text-transform: uppercase; /* viết hoa */
    padding: 8px 16px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.3s, color 0.3s;
}

    .button-transparent:hover {
        background-color: #007BFF;
        color: white;
    }


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

body {
  margin-bottom: 60px;
}