@media (max-width: 576px) {
    html body {
        font-family: 'Arial', 'Tahoma', 'Helvetica', sans-serif;
                background-repeat: no-repeat;
        background-attachment: fixed;
        background-size: cover;
        min-height: 400px;
    }
}
@media (min-width: 577px) {
    html body {
        font-family: 'Arial', 'Tahoma', 'Helvetica', sans-serif;
                background-repeat: no-repeat;
        background-attachment: fixed;
        background-size: cover;
        min-height: 400px;
    }

    body, h5, h6 {
        font-size: 1.5em; !IMPORTANT;
    }

    h1 {
        font-size: 3.0em; !IMPORTANT;
    }

    h2 {
        font-size: 2.7em; !IMPORTANT;
    }

    h3 {
        font-size: 2.4em; !IMPORTANT;
    }

    h4 {
        font-size: 2.1em; !IMPORTANT;
    }
}

.btn-outline-light {
    font-size: 2.0em !IMPORTANT;
    border-radius: 5px;
    box-shadow: 10px 12px 7px rgba(0,0,0,.5),-5px -5px 10px rgba(255,255,255,.1) !IMPORTANT;
}

.npk-image-radio {
    cursor: pointer;
    border: 2px solid transparent;
    border-radius: 0.5rem;
    transition: border-color 0.3s;
}
.npk-image-radio:checked + label {
    border-color: #007bff;
    box-shadow: 0 0 0.5rem rgba(0, 123, 255, 0.5);
}
.npk-image-radio + label img {
    opacity: 1.0;
}
.npk-image-radio:checked + label img {
    opacity: 0.9;
}

.npk-image {
    background: #fdfbfb;
    border-radius: 10px;
    padding: 10px;
}

@media (max-width: 767px) {
    .npk-label {
        width: 100%;
        border-radius: 25px;
        background: #adb6d3;
        font-size: 160px;
    }
}
@media (min-width: 768px) {
    .npk-label {
        width: 100%;
        border-radius: 25px;
        background: #adb6d3;
        font-size: 60px;
    }
}
@media (min-width: 1400px) {
    .npk-label {
        width: 100%;
        border-radius: 25px;
        background: #adb6d3;
        font-size: 160px;
    }
}

.npk-overlay-green {
    position: relative;
    top: -80px;
    left: 20px;
    color: green;
    display: none;
    font-size: 48px;
}

table tbody tr td {
    border: 1px solid #d1d1d1;
}

@media (min-width: 1401px) {
    .npk-card-lesson {
        margin-top: 20px;
        margin-bottom: 20px;
        padding: 40px;
        border-radius: 25px;
                height: 660px;
        overflow: scroll;
        font-size: 300%;
    }
    .npk-card-content {
        margin-top: 30px;
        margin-bottom: 30px;
        padding: 50px;
        border-radius: 25px;
                font-size: 200%;
    }
}
@media (max-width: 1400px) {
    .npk-card-lesson {
        margin-top: 0px;
        padding: 15px;
        border-radius: 25px;
                height: 400px;
        overflow: scroll;
    }
    .npk-card-content {
        margin-top: 15px;
        padding: 15px;
        border-radius: 25px;
            }

}
.npk-card-lesson img {
    max-width: 100%;
}

.npk-card-lesson table {
    font-size: 17px;
}

@media (min-width: 768px) {
    .npk-img-avatar {
        position: fixed;
        right: 150px;
        bottom: 50px;
        width: 250px;
        z-index: 10;
    }
}
@media (max-width: 769px) {
    .npk-img-avatar {
        position: fixed;
        right: 0px;
        bottom: 10px;
        width: 100px;
        z-index: 10;
    }
}

.npk-student-control-item {
    }

.npk-student-control {
    width: 100%;
    box-shadow: 0 0 0.5rem rgba(0, 123, 255, 0.5);
    }

.bg-theme {
    }

.btn {
    }

.navbar-toggler {
    color: white;
}

.npk-listening-icon {
    font-size: 256px;
}

.navbar-brand {
    background-image: radial-gradient(white 40%, transparent 60%, transparent 100%);
    padding: 20px;
}