.logo-ns { padding-bottom: 6px; } .logo-ns img { width: 322px; } @media screen and (max-width: 400px) { .logo-ns img { width: 160px; } } .mat-drawer-content { margin-top: 240px; } mat-sidenav.mat-drawer.mat-drawer-side.mat-drawer-side.mat-sidenav-fixed { z-index: 0; } .centerBoxContainer { position: absolute; top: 0; left: 0; width: 100%; text-align: center; background-color: #ffffff; z-index: 9999999; } .centerBoxContainer:before { content: " "; width: 0; height: 100%; display: inline-block; vertical-align: middle; } .centerBoxContainer .centerBox { display: inline-block; vertical-align: middle; padding: 20px; }