section:nth-child(1) {
    margin: 0 120px 0 240px;
    border-left: 5px solid #ffda94;
}

section:nth-child(n+2):nth-child(-n+8) {
    margin: 0 100px 0 250px;
    border-right: 5px solid #ffda94;
}

section:nth-child(n+9):nth-child(-n+11) {
    margin: 0 120px 0 240px;
    border-left: 5px solid #ffda94;
}

section:nth-child(12) {
    margin: 0 100px 0 250px;
    border-right: 5px solid #ffda94;
}

section:nth-child(13) {
    margin: 0 100px 0 250px;
    border-right: 5px solid #ffda94;
}

section:nth-child(14) {
    margin: 0 100px 0 250px;
    border-right: 5px solid #ffda94;
}

section:nth-child(15) {
    margin: 0 100px 0 250px;
    border-right: 5px solid #ffda94;
}

section:nth-child(16) {
    margin: 0 120px 0 240px;
    border-left: 5px solid #ffda94;
}

.edu-video{
    text-align: center;
}