$dark-blue: #222;
$green: #90feb5;
$action-color: $green;

* {
  box-sizing: content-box;
}

div{
  height: 100%;
  animation: hue-rotate 10s linear infinite;
}

@keyframes hue-rotate {
      from {
        -webkit-filter: hue-rotate(0);
        -moz-filter: hue-rotate(0);
        -ms-filter: hue-rotate(0);
        filter: hue-rotate(0);
      }
      to {
        -webkit-filter: hue-rotate(360deg);
        -moz-filter: hue-rotate(360deg);
        -ms-filter: hue-rotate(360deg);
        filter: hue-rotate(360deg);
      }
}