SOURCE

<p>阴影</p>

body {
    text-align: center;
    background-color:#4D5EB3;
}
p{
    font-size: 60px;
    /* font-weight: bold; */
    color:#ddd;
    position: relative;
    text-align: left;
    letter-spacing: 10px;
}
p::after{
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    position: absolute;
    bottom: 0px;
    left: 0px;
    z-index: 1;
    /* transform: all 4s; */
    background-image: linear-gradient(45deg,transparent 45%, blue 45%,blue 55%,transparent 45%);
    background-size: 2px 4px;
    /* -webkit-background-clip: text; */
    -webkit-text-fill-color: transparent;
    animation: yinying 4s linear infinite;
}
@keyframes yinying{
    0%{
        background-position: 0,0;
    }
}