@-webkit-keyframes mask-move {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(129px);
  }
}
@keyframes mask-move {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(129px);
  }
}
@-webkit-keyframes mask-inner-move {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-129px);
  }
}
@keyframes mask-inner-move {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-129px);
  }
}
*,
*:before,
*:after {
  box-sizing: border-box;
}

body,
html {
  height: 100%;
}

body {
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #89cb66;
  font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
}

.focus {
  font-size: 3rem;
  text-transform: uppercase;
  color: white;
  letter-spacing: 0.2rem;
  line-height: 1;
  position: relative;
  width: 179px;
}
.focus:before {
  content: "Focus";
  filter: blur(3px);
}
.focus:after {
  content: "";
  position: absolute;
  width: 50px;
  height: calc(100% + 8px);
  top: -4px;
  left: 0;
  border-top: 2px solid;
  border-bottom: 2px solid;
  -webkit-animation: mask-move 1s linear infinite alternate;
          animation: mask-move 1s linear infinite alternate;
}
.focus--mask {
  overflow: hidden;
  position: absolute;
  width: 50px;
  height: 100%;
  top: 0;
  left: 0;
  background: #89cb66;
  -webkit-animation: mask-move 1s linear infinite alternate;
          animation: mask-move 1s linear infinite alternate;
}
.focus--mask-inner {
  -webkit-animation: mask-inner-move 1s linear infinite alternate;
          animation: mask-inner-move 1s linear infinite alternate;
}

.credits {
  color: white;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  font-weight: 200;
  letter-spacing: 0.05rem;
  font-style: italic;
  text-align: center;
}
.credits a {
  color: white;
  text-decoration: none;
  font-weight: normal;
}
.credits a:hover {
  text-decoration: underline;
}