.loader {
        width: fit-content;
        font-weight: bold;
        font-family: monospace;
        font-size: 30px;
        background:linear-gradient(90deg,#000 50%,#0000 0) right/200% 100%;
        animation: l21 2s infinite linear;
}
.loader::before {
        content :"Loading...";
        color: #0000;
        padding: 0 5px;
        background: inherit;
        background-image: linear-gradient(90deg,#fff 50%,#000 0);
        -webkit-background-clip:text;
        background-clip:text;
}

@keyframes l21{
        100%{background-position: left}
}