solved it with:
.note {
mix-blend-mode: multiply;
background: linear-gradient(to left, transparent 50%, yellow 50%) right;
background-size: 200%;
transition: 2s ease-out;
background-position: 0%;
animation: marker 5s;
}
@-webkit-keyframes marker {
0% { background-position: 100%; }
100% { background-position: 0%; }
}