placeholder-animation.scss

.animated-placeholder {
    background: linear-gradient(-90deg, #eef2f6, #ffffff, #bcbfc3);
    background-size: 400% 400%;

    -webkit-animation: left-to-right 3s ease infinite;
    -moz-animation: left-to-right 3s ease infinite;
    animation: left-to-right 3s ease infinite;
}

@-webkit-keyframes left-to-right {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}
@-moz-keyframes left-to-right {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}
@keyframes left-to-right {
    0%{background-position:0% 50%}
    50%{background-position:100% 50%}
    100%{background-position:0% 50%}
}