* {
  box-sizing: border-box;
}

html {
  padding: 0;
  margin: 0;
}

.preloader {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background-color: #11111;
}
.preloader .pacman {
  width: 200px;
  height: 200px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -100px;
  background-color: #00c2de;
  border-radius: 50%;
}
.preloader .pacman::after {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0px 100px 0px 0;
  border-color: transparent #ffffff transparent transparent;
  position: absolute;
  top: 50%;
  right: -1px;
  -webkit-transform: translateY(-50%);
          transform: translateY(-50%);
  -webkit-animation: eat 300ms linear infinite alternate;
          animation: eat 300ms linear infinite alternate;
}

@-webkit-keyframes eat {
  from {
    border-width: 0 100px 0 0;
  }
  to {
    border-width: 70px 100px 70px 0;
  }
}

@keyframes eat {
  from {
    border-width: 0 100px 0 0;
  }
  to {
    border-width: 70px 100px 70px 0;
  }
}