.header {
    min-height:200px;
    left:0px;
    right:0px;
    top:0px;
    z-index:1000;
    position:fixed;
}
.row_1 {
    clear: both;
    width: auto;
    min-height: 100px;
    background-color:#000000;
}
.row_2 {
    clear: both;
    width: auto;
    min-height: 100px;
    background-color:rgba(0, 0, 0, 0.8);
}
img.image1 {
    height: auto;
    margin-left:auto;
    margin-right:auto;
    display:block;
    width:345px;
}
@media only screen and (min-width : 768px) {
    .header {
        min-height: 0px;
        width:100%;
    }
    .row_1 {
        min-height: 0px;
    }
    .row_2 {
        min-height: 47px;
    }
    img.image1 {
        width: 30%;
    }
}
@media only screen and (min-width : 1024px) {
    .header {
        width:100%;
    }
    .row_1 {
        clear: both;
        width: auto;
    }
    .row_2 {
        clear: both;
        width: auto;
        min-height:47px;
    }
    img.image1 {
        width:30%;
    }
}