header.masthead{
    background: linear-gradient(to bottom,rgba(92,77,66,0.4) 0,rgba(92,77,66,.4) 100%),url(../img/bg-masthead.jpg);
        background-position: center;
    background-repeat: no-repeat;
    background-attachment: scroll;
    background-size: cover;
}

.iframe-container{
    position: relative;
    width: 70%;
    padding-bottom: 56.25%; /* Ratio 16:9 ( 100%/16*9 = 56.25% ) */
}
.iframe-container > *{
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
}

img.mfp-img{
    image-orientation: none;
}