.loader {
    width: 120px;
    height: 22px;
    border-radius: 40px;
    color: #514b82;
    border: 2px solid;
    position: relative;
    overflow: hidden;
    margin: auto;
}
    .loader::before {
        content: "";
        position: absolute;
        margin: 2px;
        width: 14px;
        top: 0;
        bottom: 0;
        left: -20px;
        border-radius: inherit;
        background: currentColor;
        box-shadow: -10px 0 12px 3px;
        clip-path: polygon(0 5%, 100% 0,100% 100%,0 95%,-30px 50%);
        animation: ct4 1s infinite linear;
    }

@keyframes ct4 {
    100% {
        left: calc(100% + 20px)
    }
}