.left_box {
    float: left;
    width: 65%;
}

.right_box {
    float: right;
    width: 35%;
}

iframe {
    width: 100%;
}

img {
    width: 100%;
}

.grd_sqr {
    float: left;
    width: 30%;
    padding-bottom: 33%;
    margin: 1.33%;
    background-color: #1E1E1E;
}