* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
    background-color: #1d1d1d;
    color: #f5f5f5;
    margin: 8px;
}
ul {
    width: 100%;
    height: auto;
    font-size: 0;
    margin-left: 2px;
    margin-top: 2px;
}
li {
    display: inline-block;
    background-color: #f5f5f5;
    width: 1px;
    height: 1px;
    margin-right: 1px;
    margin-bottom: 1px;
    padding: 0;
}
li:last-child {
    background-color: #f5f5f5;
    animation: blinker 1s infinite;
}
@keyframes blinker {
  from {background-color: #f5f5f5;}
  to {background-color: #1d1d1d;}
}