.remark-slide-content:not(.title-slide)::before {
  content: "";
  position: absolute;
  bottom: 5px;
  left: 10px;
  width: 80px;
  height: 30px;
  background: url("lab_logo.jpg") no-repeat center;
  background-size: contain;
  pointer-events: none;
  z-index: 0;
}

.logo {
  position: absolute;
  top: 94%;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}