.loader {
    width: 100%;
    height: 3px;
    display: inline-block;
    position: relative;
    background: rgba(255, 255, 255, 0.15);
    overflow: hidden;
}
.loader::after {
    content: '';
    width: 192px;
    height: 3px;
    background: #df387c;
    position: absolute;
    top: 0;
    left: 0;
    box-sizing: border-box;
    animation: animloader 2s linear infinite;
}

@keyframes animloader {
    0% {
        left: 0;
        transform: translateX(-100%);
    }
    100% {
        left: 100%;
        transform: translateX(0%);
    }
}