header {
    width: 100%;
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    background-color: #fff;
    box-shadow: 0px 1px 5px 0 #ccc;
    border-bottom: 1px solid #AFBDD5;
    padding: 1rem 0 1rem 0;
    margin-bottom: 1.5rem;
    z-index: 100;
}