header{
    top: 0;
    width: 100%;
}
.header-fixed{
    position: fixed !important;
}
.header-fixed header{
    background: #fff !important;
    box-shadow: 0px 1px 5px 0px rgb(0 0 0 / 20%);
}
header#masthead{
    transition: 300ms !important;
}