.header {

    width:100%;
    height:148px;
    background-image:url('./files/elements/mainHeader_left.jpg');
    background-size:cover;
    background-position:center center;
    background-repeat:no-repeat;
    position:relative;

}

@media screen and (max-width:1023px) {

    .header {
        height:90px;
    }

}

@media screen and (max-width:930px) {

    .header {
        height:77px;
    }

}