.loader {
    background-color: #ededed;
    background: linear-gradient(
        100deg,
        rgba(255, 255, 255, 0) 40%,
        rgba(255, 255, 255, .5) 50%,
        rgba(255, 255, 255, 0) 60%
    ) #ededed;
    background-size: 200% 100%;
    background-position-x: 180%;
    animation: .7s loader ease-in-out infinite;
}
@keyframes loader {
    to {
        background-position-x: -20%;
    }
}