.intro-header {
    top: 0;
    padding: 24px 2em;
    height: 64px;
    z-index: 10;
    width: 100%;
    position: sticky;
    background: white;
}
.intro-back {
    cursor: pointer;
}

.intro-back:hover {
    text-decoration: none;
}

.intro-back:hover i {
    text-decoration: none;
}

.intro-back:hover span {
    text-decoration: underline;
}

.intro1-container {
    width: 825px;
    padding-top: 80px;
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
}

.intro1-heading {
    font-size: 15px;
    font-weight: bold;
}

.intro1-thumbnail {
    width: 100%;
    object-fit: contain;
    height: 200px;
}

@media (max-width: 768px) {
    .intro1-thumbnail {
        margin: 20px 0;
    }
}
.intro1-title {
    font-size: 35px;
}

.intro1-media {
    font-size: 13px;
}

.intro1-introduce {
    font-size: 17px;
    color: rgb(33, 33, 33, 0.5);
}

.intro-heading {
    font-size: 15px;
    font-weight: bold;
}

.intro-thumbnail {
    width: 100%;
    object-fit: cover;
    height: 200px;
}

.intro-title {
    font-size: 35px;
}

.intro-media {
    font-size: 13px;
}

.intro-introduce {
    font-size: 17px;
    color: rgb(33, 33, 33, 0.5);
}

.intro-introduce .btn {
    width: 75%;
    font-size: 15px;
    margin: 50px 25px;
    border-radius: 5px;
    font-weight: 600;
}

.tuts-item {
    border-bottom: 1px solid rgb(189, 189, 189, 0.5);
}

.tuts-status-icon {
    color: #707070;
    font-size: 26px;
}

.tuts-status-icon.checked {
    color: #2ce080;
}

.tuts-title {
    color: #000;
    font-size: 15px;
}

.tuts-subtitle {
    font-style: italic;
    font-size: 14px;
    color: #ababab;
}

.dv-star-rating {
    line-height: 0;
}

.btn-learn {
    font-size: 15px;
    border-radius: 5px;
    font-weight: 600;
    padding: 18px;
    width: 40%;
    background-color: #ff8a00;
    border-color: #ff8a00;
    color: white;
}

.btn-learn:hover {
    background-color: #ef8100 !important;
    border-color: #ef8100 !important;
    color: white;
}