.header-top{
background: rgba(27, 70, 107, 0.4); //depends on 'a' value here that is 0.4
border-top: 5px solid#000;
height:6.5em;
}
background: rgba(27, 70, 107, 0.4); //depends on 'a' value here that is 0.4
border-top: 5px solid#000;
height:6.5em;
}