（我认为） 有用的css代码块

1、效果图

image.png

//在块前面加两竖线 其实也可换成:after
.markdown blockquote:before {
    width: 1.5px;
    top: 0;
    bottom: 0;
    left: 25px;
    background-color: transparent;
    border: 1px solid #dfd6c5;
    border-top: 0;
    border-bottom: 0;
    position: absolute;
    content: ' ';
    overflow: hidden;
}

使用css的background

    background: url(../uploadfile/banner/exhibition_banner.png) no-repeat center;
    background-image: url(../uploadfile/banner/exhibition_banner.png);
    background-position-x: center; 水平居中
    background-position-y: center; 垂直居中
    background-size: initial;
    background-repeat-x: no-repeat;
    background-repeat-y: no-repeat;
    background-attachment: initial; /* 可选 fixed固定*/
    background-origin: initial;
    background-clip: initial;
    background-color: initial;