Gmail Dark Overrides

custom.css

/* sidebar */
.aZ6 {
  background-color: #282a2e;
}
/* sidebar-bottom */
.bhZ.bym .aj5, .vhZ.bjB .aj5 { 
  background-color: #1d1f21;
}

/* header */
header.gb_Ta {
  background-color: #282a2e !important;
  box-shadow: 0 0 16px rgba(0, 0, 0, 0.75);
}
.gb_fe .gb_Se {
  background-color: #1d1f21;
}

/* messages list item */
.zA {
  background-color: #1d1f21;
}
.zA:hover {
  box-shadow: inset 0 -1px 0 0 rgba(255,255,255,0.12);
  background-color: #282a2e;
}

/* topbar tools */
.G-atb, .aeH {
  background-color: #282a2e;
}

/* compose button */
.z0>.L3 {
  color: #ffffff;
  background-color: #373b41;
}
.z0>.L3:hover, .z0>.L3:focus {
  background-color: #1d1f21;
}

/* main container */
.bkK {
  background-color: #1d1f21;
}