.itch {
    color: inherit;
    text-decoration: none;
}

.itch {
    background: linear-gradient( to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0) ), linear-gradient( to right, rgb(255, 255, 255), rgb(255, 255, 255));
    background-size: 80% 21%, 0 91%;
    background-position: 85%;
    background-repeat: no-repeat;
    border-radius: 10px;
    transition: background-size 500ms cubic-bezier(.14,1.7,.45,.45);
}

    .itch:hover {
        background-size: 0 21%, 80% 91%;
    }