.postContainer{
    max-width: 1300px;
    margin: auto;
    padding-top:   10rem;
    margin-bottom: 5rem;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-gap: 1rem; 
    justify-content: center;
    align-items: center ;
}
.postContainer iframe{
    width: 400px;
    height: 400px;
    max-width: 400px;
    max-height: 400px;
    border-radius: 0;
    border: none;
    outline: none;
    z-index: 1;
}


@media screen and (max-width:1250px) {
    .postContainer{
        max-width: 1000px;
    }
    .postContainer iframe{
        width: 300px;
        height: 300px;
    }
}
@media screen and (max-width:1050px) {
    .postContainer{
        grid-template-columns: 1fr 1fr;
        max-width: 800px;
    }
    .postContainer iframe{
        width: 350px;
        height: 300px;
    }
}
@media screen and (max-width:750px) {
    .postContainer{
        margin-top: 6rem;
        grid-template-columns: 1fr;
        max-width: 600px;
    }
    .postContainer iframe{
        margin: 1rem auto;
        width: 400px;
    }
}
@media screen and (max-width:450px) {
    .postContainer{
        max-width: 350px;
    }
    .postContainer iframe{
        width: 100%;
    }
}