#mainCont {
    margin-top: 25px;
    display: grid;
    grid-template-columns: 8fr 3fr;
    grid-template-rows: auto;
}

#sideR {
    background-color: rgb(244, 253, 253);
    border-radius: 5px;
    grid-column-start: 2;
    grid-column-end: 3;
    grid-row-start: 1;
    grid-row-end: 4;
}

h2, h3, h4 {
    text-align: center;
    color: white;
    padding: 3px;
    border-radius: 5px;
    background-color: #dd5f56;
}

.flexCont {
    display: flex !important;
    flex-wrap: wrap;
    justify-content: space-evenly;
    text-align: center;
}

.embvid{
    margin: 1%;
    width: 500px;
    height: 300px;
}

.embvids{
    margin: 1%;
    display: none;
    max-width: 500px;
    max-height: 300px;
}

#preptext{
    padding: 5%;
    font-size: 1.25rem;
    font-weight: 300;
    text-align: center;
}

@media (max-width: 1199px) {
    #mainCont {
        margin-top: 25px;
        display: block;
    }

    #sideR {
        background-color: rgb(244, 253, 253);
        border-radius: 5px;
        grid-column-start: 1;
        grid-column-end: 2;
        grid-row-start: 2;
        grid-row-end: 3;
    }

} 

@media (max-width: 991px) {
    #gridContM{
        display: none;
    }

    #mainCont {
        margin-top: 25px;
        display: block;
    }

    #headImg{
        display: none;
    }

}

@media (max-width: 516px) {
    .embvid{
        display: none;
    }
    
    .embvids{
        display: inline-block;
    }

}