教程：

放到后台自定义CSS

.absolute::before {
    content: '';
    display: block;
    position: absolute;
    left: 0;
    top: 58%;
    right: 0;
    bottom: 0;
    transform: scale(1.01);
    background: linear-gradient(180deg, rgb(255 255 255 / 0%) 0%, var(--body-bg-color) 100%);
}