html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  background-color: #282F44;
  overflow: hidden;
}

.cat {
  width: 150px;
  position: absolute;
  bottom: 0px;
  transition: 0.3s;
}

#cat_blue {
  left: 15%;
}

#cat_grey {
  left: 30%;
}

#cat_yellow {
  left: 45%;
}

#cross {
  position: absolute;
}
#cross:before, #cross:after {
  content: "";
  display: block;
  width: 60px;
  height: 15px;
  background-color: #fff;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
}
#cross:after {
  transform: translate(-50%, -50%) rotate(136deg);
}