:root{--alt-bg:#3b5172;--alt-sep:rgba(0,0,0,0.06)}main>section:nth-of-type(even),main>.section:nth-of-type(even),main>.content-section:nth-of-type(even),.main>section:nth-of-type(even){background:var(--alt-bg);border-top:1px solid var(--alt-sep);border-bottom:1px solid var(--alt-sep)}