SOURCE

<div class="welcome">
    欢迎参加百度前端技术学院
</div>

@keyframes text-streamer-animation {
    0% {
        background-position: 100% 0;
    }
    100% {
        background-position: -40% 0;
    }
}

.welcome {
    font-size: 2rem;
    color: red;
    background-image: -webkit-linear-gradient(transparent, transparent), -webkit-linear-gradient(-45deg, red 30%, blue 40%, red 50%);
    -webkit-background-clip: text;
    background-size: 200% 100%;
    -webkit-text-fill-color: transparent;
    background-position: 100% 0;
    animation: text-streamer-animation 3s cubic-bezier(.05,.36,.94,.33) infinite;
}