section.course-btwo {
    padding-bottom: 100px;
    background-color: #00274e;
    font-family: roboto,sans-serif
}

section.course-btwo .heading h2 {
    font-size: 40px;
    font-weight: 700;
    line-height: 50px;
    letter-spacing: -1px;
    color: #fff;
}

@media(max-width: 991px) {
    section.course-btwo .heading h2 {
        margin:0 0 30px 24px
    }
}

section.course-btwo #courseTabContent .tab-pane {
    position: relative;
    aspect-ratio: 806/460;
    width: 100%;
    margin-bottom: 100px;
}

section.course-btwo #courseTabContent .tab-pane .box {
    width: 100%;
    height: 100%;
}

section.course-btwo #courseTabContent .tab-pane .box-image {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    cursor: pointer
}

section.course-btwo #courseTabContent .tab-pane img {
    width: 100%;
    height: 100%;
    object-fit: cover
}

section.course-btwo .btn-play,section.course-btwo .btn-pause {
    position: absolute;
    opacity: 0;
    visibility: hidden;
    z-index: -1;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    width: 100%;
    height: 100%;
    cursor: pointer
}

section.course-btwo .btn-play.active,section.course-btwo .btn-pause.active {
    opacity: 1;
    visibility: visible;
    z-index: 3
}

section.course-btwo .btn-play svg,section.course-btwo .btn-pause svg {
    width: 88px;
    height: 88px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%)
}

.video_youtube {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1
}

.video_youtube iframe {
    height: 100%;
    width: 100%
}

section.course-btwo #courseTab {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
    overflow-y: scroll;
    max-height: 380px;
    border: 0!important
}

section.course-btwo .name-class {
    font-size: 24px;
    font-weight: 700;
    line-height: 28px;
    color: #fff
}

[class*=course-tow-pause] {
    display: none
}

[class*=course-tow-pause].active {
    display: block
}

[class*=course-tow-play].hidden {
    display: none
}

section.course-btwo #courseTabContent .tab-pane .box.course-video {
    cursor: pointer
}

section.course-btwo .right-content {
    display: flex;
    height: 100%;
    flex-direction: column;
    justify-content: start;
}


section.course-btwo #courseTabContent .desc {
    margin-top: 10px;
    position: absolute;
    color: #ffffff;
}

@media(max-width: 991px) {
    section.course-btwo .name-class {
        font-size:20px;
        line-height: 24px;
        margin-bottom: 12px
    }
}

section.course-btwo .nav-item .nav-link {
    background: rgba(255,255,255,.2);
    font-size: 20px;
    font-weight: 400;
    line-height: 24px;
    color: #fff;
    padding: 16px;
    margin-bottom: 8px;
    border-radius: 0!important;
    border: 0!important;
    display: flex;
    justify-content: space-between
}

section.course-btwo .nav-item .nav-link.active {
    background: rgba(255,255,255,.6)
}

.content-bottom {
    margin-top: 24px
}

@media(max-width: 991px) {
    .content-bottom {
        margin-bottom:28px
    }
}

.content-bottom .desc {
    font-size: 17px;
    font-weight: 400;
    line-height: 20px;
    color: #fff;
    margin-bottom: 32px;
    text-align: justify
}

.lecturer,.time {
    font-size: 20px;
    font-weight: 400;
    line-height: 24px;
    color: #fff;
    margin-bottom: 12px
}

section.course-bfour .box-content a {
    color: #fff
}

section.course-bfour .box-content a:hover {
    color: #427eeb
}

@media(max-width: 991px) {
    .item-three {
        order:4
    }

    .item-four {
        order: 3
    }
}