keep div element on top of content

- 
.fixed-header {
    width: 100%;
    margin: 0 auto;
    position: fixed;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    box-sizing: border-box;
    z-index: 999;
}

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